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Shido88 Group Title

Determine the value of f(-6), f(3/2), f(2c) and f(c+1), then simplify as much as possible Question : f(x) = 3x^2 - 4x

  • one year ago
  • one year ago

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  1. Shido88 Group Title
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    @Aylin help please :D

    • one year ago
  2. Aylin Group Title
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    Well, in the first two, just take the appropriate number and plug it in where x is. Then simplify it down. For the third one (2c) replace x with 2c, then see what you get. Same for the fourth one. The first two are plug'n'chug, but if you need help with the second two I'll stick around.

    • one year ago
  3. Shido88 Group Title
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    the second two, just plug it in to every x in the problem ?

    • one year ago
  4. Aylin Group Title
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    Mhm. So f(2c) would like\[f(2c)=3 \times (2c)^{2}-4 \times (2c)\]

    • one year ago
  5. Shido88 Group Title
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    Ok let me try thanks!

    • one year ago
  6. Shido88 Group Title
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    ummm question

    • one year ago
  7. Aylin Group Title
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    Yes?

    • one year ago
  8. Shido88 Group Title
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    kinda dumb question but for the first one f(-6) i did -6=3(-6)^2-4(-6) -6=108+24 -6=132 then at this step do you add the 6 over or minus the 132 over ?? lol

    • one year ago
  9. Shido88 Group Title
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    it usually easier if one size has a (x)

    • one year ago
  10. Aylin Group Title
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    Well, the left side is f(-6) not -6. So when you get to f(-6)=132, you are finished with that part.

    • one year ago
  11. Aylin Group Title
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    Since you've found the value in the range (132) that corresponds to the value of -6 in the domain.

    • one year ago
  12. Shido88 Group Title
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    i see

    • one year ago
  13. Shido88 Group Title
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    the second one i found is 3/4 hope its right

    • one year ago
  14. Shido88 Group Title
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    the third one i got: f(2c) = 4c

    • one year ago
  15. Shido88 Group Title
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    and do you divide the 2c over ?

    • one year ago
  16. Aylin Group Title
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    I also got 3/4

    • one year ago
  17. Shido88 Group Title
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    cool :D

    • one year ago
  18. Aylin Group Title
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    Well, with these problems you only need to simplify the right side, don't worry about the left side at all. In the third and fourth ones your answer will be in terms of c though.

    • one year ago
  19. Shido88 Group Title
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    so is my answer for the third one okay ?

    • one year ago
  20. Aylin Group Title
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    Well, no.\[(2c)^{2}=4c^{2}\]and there is nothing in there to cancel it, so you should have a c^2 term.

    • one year ago
  21. Shido88 Group Title
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    how did you get 2c^2 on the left side ?

    • one year ago
  22. Shido88 Group Title
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    isn't it 2c ?

    • one year ago
  23. Aylin Group Title
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    \[f(2c)=3(2c)^{2}-4(2c)\]and\[(2c)^{2}=4c^{2}\]so\[f(2c)=3 \times 4c^{2}-4(2c)\]

    • one year ago
  24. Shido88 Group Title
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    oh so you can't multiply the term -4 with 2c ?

    • one year ago
  25. Aylin Group Title
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    You can, but I was leaving it for you to do. :P

    • one year ago
  26. Shido88 Group Title
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    ohhhh lol

    • one year ago
  27. Shido88 Group Title
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    at first i thought u can make (2c)^2 = 4c and just X 3 = 12c

    • one year ago
  28. Shido88 Group Title
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    i was wrong :|

    • one year ago
  29. Aylin Group Title
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    Pretty close, just forgot the ^2 part of it. :P

    • one year ago
  30. Shido88 Group Title
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    u mean 12c^2 ?

    • one year ago
  31. Aylin Group Title
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    Yep

    • one year ago
  32. Shido88 Group Title
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    but why ? :O isn't it already been done on the 2c^2 ?why ^2 another

    • one year ago
  33. Shido88 Group Title
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    @___@

    • one year ago
  34. Aylin Group Title
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    Well\[(2c)^{2}\]is the same thing as\[2c \times 2c\]Does that make it more clear?

    • one year ago
  35. Shido88 Group Title
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    does that make 4c ?

    • one year ago
  36. Shido88 Group Title
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    and 4c x 3 = 12c lol ?

    • one year ago
  37. Aylin Group Title
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    \[2c \times 2c = 4c^{2}\]

    • one year ago
  38. Shido88 Group Title
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    ohhh lol =___=

    • one year ago
  39. Shido88 Group Title
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    omg...my mind is somewhere else today....sorry

    • one year ago
  40. Aylin Group Title
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    Mine is too, don't worry.

    • one year ago
  41. Shido88 Group Title
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    naw, your good :D

    • one year ago
  42. Shido88 Group Title
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    so once i got f(2c) = 12c^2 - 8c then what can i do next?

    • one year ago
  43. Aylin Group Title
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    Well, at this point all of the same powers of c are together, so you're done.

    • one year ago
  44. Shido88 Group Title
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    what do you mean by "same powers of c are together" ? :d

    • one year ago
  45. Aylin Group Title
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    Well, there's only one c^2 term and only one c term. You can't combine the c^2 and the c terms, so there is nothing left to do.

    • one year ago
  46. Shido88 Group Title
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    i see

    • one year ago
  47. Shido88 Group Title
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    the fourth one im stuck completely :D

    • one year ago
  48. Aylin Group Title
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    Well, what is\[(c+1)^{2}\]?

    • one year ago
  49. Shido88 Group Title
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    (c+1)(c+1)

    • one year ago
  50. Aylin Group Title
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    So FOIL it out! :P

    • one year ago
  51. Shido88 Group Title
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    ohh let see

    • one year ago
  52. Shido88 Group Title
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    c^2+2c+1 and i think u can factor it more right ?

    • one year ago
  53. Aylin Group Title
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    Well, we don't want to factor it right now. So now\[f(c+1)=3 \times (c^{2}+2c+1)-4 \times (c+1)\]Can you finish it from there?

    • one year ago
  54. Shido88 Group Title
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    kk hold on

    • one year ago
  55. Shido88 Group Title
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    i think it is : f(c+1)=3c^2 + 2c -1

    • one year ago
  56. Aylin Group Title
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    Yep!

    • one year ago
  57. Shido88 Group Title
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    awesome! lol

    • one year ago
  58. Shido88 Group Title
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    so is that it ? o_0

    • one year ago
  59. Aylin Group Title
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    Yep

    • one year ago
  60. Shido88 Group Title
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    cool! thanks Aylin

    • one year ago
  61. Aylin Group Title
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    You're welcome.

    • one year ago
  62. Shido88 Group Title
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    your really good in math :D genius maybe?

    • one year ago
  63. Aylin Group Title
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    Not really, I just want to teach math.

    • one year ago
  64. Shido88 Group Title
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    btw are you in college?

    • one year ago
  65. Shido88 Group Title
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    oh ! so your a teacher :D

    • one year ago
  66. Shido88 Group Title
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    wow! how lucky i am :D

    • one year ago
  67. Aylin Group Title
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    Not yet. I'm a senior at RPI.

    • one year ago
  68. Aylin Group Title
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    But next year I hope to be a teacher.

    • one year ago
  69. Shido88 Group Title
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    so your graduating next year ?

    • one year ago
  70. Aylin Group Title
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    In May

    • one year ago
  71. Shido88 Group Title
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    oh wow, almost there!

    • one year ago
  72. Shido88 Group Title
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    how many years did you spend in RPI ?

    • one year ago
  73. Aylin Group Title
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    The end of this year will make three years.

    • one year ago
  74. Shido88 Group Title
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    that's really quick wow

    • one year ago
  75. Shido88 Group Title
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    is this it ? "Rensselaer Polytechnic Institute" ?

    • one year ago
  76. Aylin Group Title
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    Yeah. Not really very fast though; I spent two years at another school first.

    • one year ago
  77. Shido88 Group Title
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    I see, still not bad. I had a friend who spends 3 years at community college and transfer

    • one year ago
  78. Shido88 Group Title
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    what's the GPA for acceptance in RPI?

    • one year ago
  79. Aylin Group Title
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    It was a community college that I came from, actually. From another college or from high school?

    • one year ago
  80. Shido88 Group Title
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    another college

    • one year ago
  81. Shido88 Group Title
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    yeah, everybody is doing community college first now aday, cuz it's so much cheaper :D

    • one year ago
  82. Aylin Group Title
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    Minimum is 3.0 Higher is better of course, but they also like it if you've been taking mostly science and math courses (or engineering if that's your major choice) if possible.

    • one year ago
  83. Shido88 Group Title
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    make sense.

    • one year ago
  84. Shido88 Group Title
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    well thanks so much for talking with me Aylin. I gotta get to dinner now :D

    • one year ago
  85. Aylin Group Title
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    Like if you took a lot of math/science courses and made mostly Bs, it would look better than if you had made As taking mostly things like Art or Chorus or History

    • one year ago
  86. Aylin Group Title
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    Bye

    • one year ago
  87. Shido88 Group Title
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    anything with science and math is better...and it's the subjects that im most terrible at. WOW..

    • one year ago
  88. Shido88 Group Title
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    well bye for now :d

    • one year ago
  89. Aylin Group Title
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    Well, the other thing is that RPI is about $60000 a year right now, so...

    • one year ago
  90. Shido88 Group Title
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    your kidding me? no way

    • one year ago
  91. Aylin Group Title
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    http://admissions.rpi.edu/aid/index.html

    • one year ago
  92. Shido88 Group Title
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    so how much for 1 semester of full time?

    • one year ago
  93. Shido88 Group Title
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    omg wow...

    • one year ago
  94. Aylin Group Title
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    About half, but it depends on what your dining plan is, where you live, ect.

    • one year ago
  95. Shido88 Group Title
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    omg so much debts...well but it's COLLEGE that we're talking about here so no suprise.. :|

    • one year ago
  96. Shido88 Group Title
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    one time I read that article about this college couples graduated with over 200k debts scared the hell out of me :|

    • one year ago
  97. Aylin Group Title
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    I'm gonna have about $45K.

    • one year ago
  98. Shido88 Group Title
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    did they tell you about the rate? or how much you have to pay back once your graduated ? I mean monthly?

    • one year ago
  99. Aylin Group Title
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    At some point probably. I don't remember what it is right now.

    • one year ago
  100. Shido88 Group Title
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    oh i see, well i hope you can pay back all the debts without too much trouble :|

    • one year ago
  101. Aylin Group Title
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    I should be able to.

    • one year ago
  102. Aylin Group Title
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    Which year are you in?

    • one year ago
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