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anonymous

  • 5 years ago

hi im having trouble understanding variables and solving equation. i need to simplify this -4y(3y)-5+2(5y+7) can anyone help

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  1. anonymous
    • 5 years ago
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    You need to distribute through to simplify. What do you not understand?

  2. anonymous
    • 5 years ago
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    all of it im new at this i get confused on were to stsrt

  3. anonymous
    • 5 years ago
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    Ok. Well when you multiply variables the format is as follows. Let * be multiplication. \[x*x=x^2\] and \[x*x*x=x^3\] and so on.

  4. anonymous
    • 5 years ago
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    ok

  5. anonymous
    • 5 years ago
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    -12y²-5+10y+14

  6. anonymous
    • 5 years ago
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    So maybe it's easier to work through the problem, or just spit out the answer like what has been done already.

  7. anonymous
    • 5 years ago
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    cyter how did you come up with that . if that is the answer fine but that dose not tell me how to do it

  8. anonymous
    • 5 years ago
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    yes i would like to work through it step by step please so i can under stand it better

  9. anonymous
    • 5 years ago
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    Ok so the first part you have -4y(3y). The parenthesis just separate quantities and mean to multiple. So -4 times 3 give -12 and y times y gives y². Thus you get -12y² for the first part. Does this make sense?

  10. anonymous
    • 5 years ago
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    Multiply* not multiple.

  11. anonymous
    • 5 years ago
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    sorry thats wrong -4(3y)-5+2(5y+7) this is the correct one

  12. anonymous
    • 5 years ago
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    Ok well you do the same process. So -4(3y) gives -12y. All I did was multiple what is in parenthesis by -4. Then you subtract 5 giving you -12y-5+2(5y+7). To simplify the 2(5y+7) you multiply what's in parenthesis by what is right outside the parenthesis. So 2 times (5y+7). So what does 2(5y+7) equal when you multiply it out?

  13. anonymous
    • 5 years ago
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    10+7=17y

  14. anonymous
    • 5 years ago
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    Not quite. 2(5y+7)=10y+14. You multiply each thing in the parenthesis by 2.

  15. anonymous
    • 5 years ago
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    2*5=10 &2*7=14

  16. anonymous
    • 5 years ago
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    So once we have simplified all parts we get: -12y-5+10y+14. The last step is to add things that look alike.

  17. anonymous
    • 5 years ago
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    You are correct above. But you can't forget the y. The y is a variable and the 5 is a coefficient. When you multiply variables by a number you just get that many variables. So 3 times y gives 3y, 7 times x gives 7x.

  18. anonymous
    • 5 years ago
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    -12y+10y +14==12y ?

  19. anonymous
    • 5 years ago
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    Ok so not sure if you were understanding how we got to -12y-5+10y+14 but if we do continue when I say add like terms I mean add any regular numbers so like -5 and 14 to get 9 and add any variables that look the same. -12y and 10y look the same. Both have a y and both have coefficients. So -12y+10y=-2y I added the -12 and 10 and just kept the y. Final answer should be -2y+9

  20. anonymous
    • 5 years ago
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    ok can we try another one

  21. anonymous
    • 5 years ago
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    Sure.

  22. anonymous
    • 5 years ago
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    -10+4(-3b+3)+2(6b-1)

  23. anonymous
    • 5 years ago
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    Now remember what I said. The number in front of the parenthesis is multiplied to each term inside the parenthesis and if there is a variable, b for example, do not leave it off.

  24. anonymous
    • 5 years ago
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    okdo i start with 4*-3 or 2*6b or dose it matter

  25. anonymous
    • 5 years ago
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    You can start wherever you like. I normally work from the left to the right so I don't forget anything :)

  26. anonymous
    • 5 years ago
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    ok

  27. anonymous
    • 5 years ago
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    4*(-3b)=12b

  28. anonymous
    • 5 years ago
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    Close. Don't forget the negative sign. So -12b

  29. anonymous
    • 5 years ago
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    4*3=12

  30. anonymous
    • 5 years ago
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    Yes.

  31. anonymous
    • 5 years ago
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    (-12b)+12+12b-11

  32. anonymous
    • 5 years ago
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    should it look like that

  33. anonymous
    • 5 years ago
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    or it should be a -2 at the end

  34. anonymous
    • 5 years ago
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    Should be a -2 at the end and don't forget the -10 at the beginning. So after simplifying a little you get -10-12b+12+12b-2

  35. anonymous
    • 5 years ago
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    now we add the like #first

  36. anonymous
    • 5 years ago
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    Yes now you add the like terms.

  37. anonymous
    • 5 years ago
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    -12b+12b=-24b

  38. anonymous
    • 5 years ago
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    You have -12b+12b so you have a negative 12b plus a positive 12b what does that give you? Not -24b.

  39. anonymous
    • 5 years ago
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    +24b

  40. anonymous
    • 5 years ago
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    Nope. If you have 12 of something and then take away 12 of something you are left with zero. -12b+12b=0

  41. anonymous
    • 5 years ago
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    -10+24b+12

  42. anonymous
    • 5 years ago
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    -10-12b+12+12b-2=-10-12b+12b+10=0

  43. anonymous
    • 5 years ago
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    rewrite ok so the answer is 0

  44. anonymous
    • 5 years ago
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    Yep :)

  45. anonymous
    • 5 years ago
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    one more ok

  46. anonymous
    • 5 years ago
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    Ok.

  47. anonymous
    • 5 years ago
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    -5(-x+2)+8(-x)+3(-2x-2)+16

  48. anonymous
    • 5 years ago
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    -5*2=-10

  49. anonymous
    • 5 years ago
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    no no oh -5*1=-4

  50. anonymous
    • 5 years ago
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    -5*2=-10

  51. anonymous
    • 5 years ago
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    -5 x -1 = 5

  52. anonymous
    • 5 years ago
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    i thought that was how it went wrong rule i gess

  53. anonymous
    • 5 years ago
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    Uh maybe you meant -5+1=-4 that's correct :)

  54. anonymous
    • 5 years ago
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    yes

  55. anonymous
    • 5 years ago
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    then-5*2=10

  56. anonymous
    • 5 years ago
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    -5*2=-10 A negative number times a positive number is a negative number. A negative number times a negative number is a positive number.

  57. anonymous
    • 5 years ago
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    ok -10

  58. anonymous
    • 5 years ago
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    Yes.

  59. anonymous
    • 5 years ago
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    so-4+-10=-14

  60. anonymous
    • 5 years ago
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    should it read -14+-7+6x+6+16 i hope!!

  61. anonymous
    • 5 years ago
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    i for got the perentacies around the -7 because of the two signs together

  62. anonymous
    • 5 years ago
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    I get 5x-10-8x-6x-6

  63. anonymous
    • 5 years ago
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    Forgot the +16 on the end. So 5x-10x-8x-6x-6+16

  64. anonymous
    • 5 years ago
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    so were did i go wrong

  65. anonymous
    • 5 years ago
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    doesn't (-x) mean 1

  66. anonymous
    • 5 years ago
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    or -1

  67. anonymous
    • 5 years ago
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    Mean 1, no. There is a 1 coefficient in front of the x. So -x is the same as -1x.

  68. anonymous
    • 5 years ago
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    so wouldn't that be 8*-1x=-7

  69. anonymous
    • 5 years ago
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    -7x oops

  70. anonymous
    • 5 years ago
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    No. You are multiplying, not adding. 8*(-1x)=-8x if you cannot add these terms since they aren't "like" terms.

  71. anonymous
    • 5 years ago
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    I'm going to go. But I will leave you with the work for the problem and maybe from what we've discussed you can figure it out.

  72. anonymous
    • 5 years ago
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    ok i told you im confused haha

  73. anonymous
    • 5 years ago
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    i hope so thanks for your help

  74. anonymous
    • 5 years ago
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    -5(-x+2)+8(-x)+3(-2x-2)+16 5x-10-8x-6x-6+16 here I just multiplied through -9x+0 here I added like terms (added the numbers with the x's by themselves to get -9x and then the numbers by themselves to get -10-6+16=0

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