A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

3x^2 +8x + 5 factoring trinomials PLEASE HELP

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    alright, let's factor : \[(3x + 5)(x + 1) = 0\] use the FOIL method to check your answer ^_^

  2. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    how do you figure them out so easy

  3. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    skill and class :)

  4. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    exactly lol ^_^ , practice makes perfect :) Believe me, I was so bad at these lol

  5. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    class hasnt helped me lol

  6. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    class won't help, it just introduces the concept, only you can help yourself :)

  7. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    it helps when 3 and 5 make 8 right in front of you tho, but it takes practice to notice it ...

  8. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i use the first and last numbers, and the signs of the middle and last numbers to figure alot of it out....

  9. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i have the test tomarrow so we'l see

  10. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    there are some underlying concepts to be aware of that help.... like how the equation is constructed to begine with and that way you can more easily tear it apart

  11. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so on this next one- 5w^2 + 13w - 6

  12. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    you're going to do great ^_^

  13. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    5(6) = 30... the last signis negative so the signs are different and its subtraction.... the middle number is positive so the largest factor is the positive...

  14. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (w+/5)(w-/5) is my setup...

  15. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1,30; 2,15, 3,5 15-3=13 use it

  16. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (w+15/5)(w-2/5) simplify and shift

  17. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (w+3)(5w-2)

  18. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok so what the first and last multipy out to the middle needs to add up to that number

  19. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    want me to go slower :)

  20. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes please

  21. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the first number is used to "calibrate" the rest. does that make sense?

  22. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  23. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok... the last number is used with the first number to find a "pool" of options for our middle number... does that make sense?

  24. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yea

  25. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    5(6) = 30...what are our options...all of them...

  26. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the factors of 30

  27. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes, what are they so we can see them :)

  28. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    start with the obvious..1,30; and move on

  29. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    15*2 6*5 30* 1

  30. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thats good, lets keep those available while we "setup" our answer

  31. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the last number is gotten by multiplication right? so the sign of that number tells us alot of what we need to use

  32. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    if the sign is (-) what are our options?

  33. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    15-2 ?

  34. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    well get to that... but for now, focus on the sign only and not the value of the number... our set up is this: ( w ) (w ) we need some signs....

  35. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    one of each

  36. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    plus and minus

  37. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    good job.... now look at the middle number and that tells you which number is bigger... does that make sense?

  38. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    whats the middle sign? + or -?

  39. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -

  40. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    that middle number is +13 right?

  41. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yea

  42. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    then we want our "bigger" numbe that we use to be (+) (w + B )(w - L ) got it?

  43. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    now which factor do we see that will subtract to get 13?

  44. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    15 2

  45. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    good (w +15 )(w -2 ) couple more loose ends to wrap up we used that "5" from the front to begin with and so we need to divide it out in this step like this: (w +15/5 )(w -2/5 ) makes sense?

  46. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  47. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    simplify those fractions and if they still look like a fraction... move the bottom in front of its x partner like this: (w +3 )(w -2/5 ) cant reduce anymore so move the denoms if there is any: (w +3 )(5w -2) and were done

  48. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you so much our teacher goes to fast

  49. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    lets do another one so I can see you do it :)

  50. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok....2x^2-2x-40

  51. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    if it cant be done like this...use the quadratic formula :)

  52. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    first step is what?

  53. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    find the factors of 40?

  54. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    close, first time last for a pool

  55. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    2(40)

  56. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    use that first now so we can divide it later... whats our pool?

  57. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh ya...let me write this down

  58. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no writing...must do it the hard way :)

  59. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok...80

  60. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    write it down.... :)

  61. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i did lol

  62. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what are our "factors" of 80 to choose from?

  63. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    2*40 8*10

  64. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    80 *1

  65. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1,80; 2,40; 4, 10; 8, 5

  66. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    8 and 10 lol forgot how to multiply

  67. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1,80; 2,40; 4,20; 8,10; 16; 5 thats better

  68. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    lets start setup.... 2x^2-2x-40 (x )(x ) we need signs...what are they?

  69. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok...both -

  70. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    both (-) meaning? that (-)(-)=(-)?

  71. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no

  72. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    one of each

  73. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the last number sign tells us we need to multiply some signs to get it....

  74. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    good, and the middle tells us which is begger right?

  75. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    or bigger depending on your accent :)

  76. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  77. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (x- B )(x+L ) we good so far? you writin this down?

  78. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  79. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    2x^2-2x-40 what numbers from our pool will give us 2?

  80. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    10 8

  81. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    +10 -8

  82. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    good. lets fill them in (x-10 )(x+8 ) now divide out the first number that "2" we used (x-10/2)(x+8/2) now what?

  83. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (x-5)(x+4)

  84. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thats right.... but let me check our work a second....

  85. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    one little after thought that usually doesnt come up is this..... we could have factored out a "2" to begin with.

  86. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    as the gcf

  87. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yep.... so we actually need to put it back in like this: 2(x-5)(x+4) to make everything right again :)

  88. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    now this will work back into the original :) you tried to trick me didnt you :)

  89. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    haha ya

  90. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thanks..you helped alot

  91. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    youre welcome.... hope you do good :)

  92. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    il get on toarrow night and let you know if your here my class is at 8am

  93. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    8am eh... is that florida time?

  94. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    nm

  95. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ahh.... your 2 or 3 hours behind me then

  96. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ya its 11

  97. amistre64
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    :) library is closing here at my college.... so have fun :)

  98. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok im off to bed thanks again

  99. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.