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Firejay5

  • 2 years ago

Simplify. Use long division to solve. Subtract your answers, NOT add 10. (x^3 + 13x^2 - 12x - 8) / (x + 2)

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  1. Firejay5
    • 2 years ago
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    My answer is -72, but I don't know what to do next

  2. Australopithecus
    • 2 years ago
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    https://www.youtube.com/watch?v=l6_ghhd7kwQ watch this video

  3. .Sam.
    • 2 years ago
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    Setup the long division as follows, solve by dividing . (x^3 + 13x^2 - 12x - 8) with (x + 2)

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  4. Australopithecus
    • 2 years ago
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    it teaches you long division of polynomials

  5. Australopithecus
    • 2 years ago
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    Check alternative forms to see if your answer is correct https://www.wolframalpha.com/input/?i=%28x^3+%2B+13x^2+-+12x+-+8%29+%2F+%28x+%2B+2%29

  6. Australopithecus
    • 2 years ago
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    what ever remainder you have left you have to keep it divided by x + 2

  7. Firejay5
    • 2 years ago
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    I know how to do it, it's just I don't know if I put it over x + 2 ----> \[\frac{ x + 2 }{ -72 }\]

  8. .Sam.
    • 2 years ago
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    What do you have for your long division?

  9. Australopithecus
    • 2 years ago
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    x+2 remains in the denominator and it should be 60

  10. Australopithecus
    • 2 years ago
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    I'm pretty sure based on wolfram alphas answer

  11. Firejay5
    • 2 years ago
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    @.Sam. so far

  12. .Sam.
    • 2 years ago
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    The answer goes with|dw:1351049782957:dw|

  13. Firejay5
    • 2 years ago
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    I know that; it's just I need help with where the -72 goes and @Australopithecus it's not 60

  14. .Sam.
    • 2 years ago
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    @Firejay5 the remainder is 60

  15. Firejay5
    • 2 years ago
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    No it's not it's -72 I did my work

  16. .Sam.
    • 2 years ago
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    Try check your work with this,

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  17. Firejay5
    • 2 years ago
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    It's -76

  18. Firejay5
    • 2 years ago
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    when you subtract; it's like you're distributing - into the second equation http://assets.openstudy.com/updates/attachments/50875f3ae4b058e80cf64652-.sam.-1351050109514-2.png

  19. Firejay5
    • 2 years ago
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    Like when you are subtracting 11x^2 - 12x - (11x^2 + 22x)

  20. Firejay5
    • 2 years ago
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    you are are trying to cancel and get rid of the 11x^2

  21. .Sam.
    • 2 years ago
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    yes, then you get -34 x

  22. Firejay5
    • 2 years ago
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    It should be -34x - 8 - (34x + 68)

  23. .Sam.
    • 2 years ago
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    -34 x 2 = -68

  24. .Sam.
    • 2 years ago
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    its not +68 but its -68

  25. Firejay5
    • 2 years ago
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    what's -8 - 68

  26. .Sam.
    • 2 years ago
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    You should be careful there, its actually -8-(-68)

  27. Firejay5
    • 2 years ago
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    Are you getting confused??? @.Sam.

  28. .Sam.
    • 2 years ago
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    don't memorize the facts, just remember that it is top minus the bottom, you look back the previous steps, all you do is to subtract the top one with the bottom one, the steps that I gave you is computer generated, its completely true.

  29. Firejay5
    • 2 years ago
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    you have to apply the negative -(34x + 68) to all number s in parentheses

  30. Australopithecus
    • 2 years ago
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    a remainder is just part of the equation that you cannot divide, so it is left with the denominator so in your case 60/(x+2)

  31. .Sam.
    • 2 years ago
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    The actual answer is 60, why are you ignoring it? Take a look at the picture below.

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  32. Australopithecus
    • 2 years ago
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    I'm basing my 60/(x+2) on the wolfram alpha simplification

  33. Firejay5
    • 2 years ago
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    It's not -34x - 68 it's -(34x + 68) the minus/negative in front of the parentheses goes with everything in it

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