## Firejay5 Group Title Simplify. Use long division to solve. Subtract your answers, NOT add 10. (x^3 + 13x^2 - 12x - 8) / (x + 2) one year ago one year ago

1. Firejay5 Group Title

My answer is -72, but I don't know what to do next

2. Australopithecus Group Title

3. .Sam. Group Title

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

4. Australopithecus Group Title

it teaches you long division of polynomials

5. Australopithecus Group Title

6. Australopithecus Group Title

what ever remainder you have left you have to keep it divided by x + 2

7. Firejay5 Group Title

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. Group Title

What do you have for your long division?

9. Australopithecus Group Title

x+2 remains in the denominator and it should be 60

10. Australopithecus Group Title

I'm pretty sure based on wolfram alphas answer

11. Firejay5 Group Title

@.Sam. so far

12. .Sam. Group Title

13. Firejay5 Group Title

I know that; it's just I need help with where the -72 goes and @Australopithecus it's not 60

14. .Sam. Group Title

@Firejay5 the remainder is 60

15. Firejay5 Group Title

No it's not it's -72 I did my work

16. .Sam. Group Title

Try check your work with this,

17. Firejay5 Group Title

It's -76

18. Firejay5 Group Title

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 Group Title

Like when you are subtracting 11x^2 - 12x - (11x^2 + 22x)

20. Firejay5 Group Title

you are are trying to cancel and get rid of the 11x^2

21. .Sam. Group Title

yes, then you get -34 x

22. Firejay5 Group Title

It should be -34x - 8 - (34x + 68)

23. .Sam. Group Title

-34 x 2 = -68

24. .Sam. Group Title

its not +68 but its -68

25. Firejay5 Group Title

what's -8 - 68

26. .Sam. Group Title

You should be careful there, its actually -8-(-68)

27. Firejay5 Group Title

Are you getting confused??? @.Sam.

28. .Sam. Group Title

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 Group Title

you have to apply the negative -(34x + 68) to all number s in parentheses

30. Australopithecus Group Title

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. Group Title

The actual answer is 60, why are you ignoring it? Take a look at the picture below.

32. Australopithecus Group Title

I'm basing my 60/(x+2) on the wolfram alpha simplification

33. Firejay5 Group Title

It's not -34x - 68 it's -(34x + 68) the minus/negative in front of the parentheses goes with everything in it