## k_lynn one year ago http://prntscr.com/86551j Simplify

1. k_lynn

@kropot72

2. anonymous

-13x^2 - 10x + 12 Would you like steps?

3. k_lynn

I got $6x ^{3}-14x ^{2}+12-10x$ But I don't think that's right.

4. anonymous

3x^3 - 3x^3

5. k_lynn

@Xep can you start from the beginning?

6. anonymous

Yes. You can rewrite the second group as -3x^3 - 6x^2 - 10 So just do 3x^3 - 3x^3 - 7x^2 - 6x^2 + 12x - 10

7. Nnesha

^yep bec first you should distribute 2nd parentheses by negative one

8. k_lynn

so the + signs that were there before are canceled out now.

9. k_lynn

because of distributing -1

10. anonymous

Yes. Since you are multiplying that whole group by -1, the signs are simply reversed

11. k_lynn

ok.

12. k_lynn

I'm not sure how to combine the like terms because of the - signs.

13. Nnesha

what did you get after distributing by negative one ?

14. k_lynn

$3x ^{3}-7x ^{2}+2-3x ^{3}-6x ^{2}-10x$

15. Nnesha

yes right now just add the coefficient$\huge\rm 3x ^{3}-7x ^{2}+2-3x ^{3}-6x ^{2}-10x$ of like terms like if like terms are -3x-4x =(-3-4)x

16. k_lynn

so for 3x^3 and 3x^3, when I add them together do I just have x^3?

17. Nnesha

no (3-3)X^3 3-3=0 WHAT do you get when you multiply anything by zero ?

18. k_lynn

0

19. Nnesha

yes so 0x^3 is just zero so that's how -3x^2 and 3x^3 cancel each other out

20. k_lynn

ok. So it's just kind of eliminated from the problem?

21. k_lynn

or cancelled from

22. Nnesha

yes right

23. k_lynn

$-7x ^{2}+2-6x ^{2}-10x$ That's what's left right.

24. Nnesha

simplify there are LIKE terms combine them!

25. k_lynn

RIght. $-13x ^{2}+2-10x$

26. Nnesha

yep looks right ro you can write in standard form $\huge\rm -13x^2-10x+2$

27. k_lynn

Thanks so much!

28. Nnesha

np :)