Question

http://prntscr.com/86551j
Simplify

Answer 1

@kropot72

Answer 2

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

Answer 3

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

Answer 4

3x^3 - 3x^3

Answer 5

@Xep can you start from the beginning?

Answer 6

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

Answer 7

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

Answer 8

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

Answer 9

because of distributing -1

Answer 10

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

Answer 11

ok.

Answer 12

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

Answer 13

what did you get after distributing by negative one ?

Answer 14

\[3x ^{3}-7x ^{2}+2-3x ^{3}-6x ^{2}-10x\]

Answer 15

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

Answer 16

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

Answer 17

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

Answer 18

0

Answer 19

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

Answer 20

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

Answer 21

or cancelled from

Answer 22

yes right

Answer 23

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

Answer 24

simplify
there are LIKE terms combine them!

Answer 25

RIght. \[-13x ^{2}+2-10x\]

Answer 26

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

Answer 27

Thanks so much!

Answer 28

np :)