Posted by **Lauren** on Wednesday, April 14, 2010 at 7:47pm.

All the directions say for these three problems is multiply and simplify. Are my answers correct? Thank you

A)(x^2+2x-3)+(2x^2-x+1)

Answer: 2x^3-6x^2+4x

B)(x+1)(2x-1)

Answer: 3x-1

C)(x-2)(x^2+2x-3)

Answer: x^3-7x+6

- Math Check -
**Damon**, Wednesday, April 14, 2010 at 7:57pm
A) You have a plus sign in the first one so it is add, not multiply. It is wrong anyway for adding or multiplying.

B) One way to do these is to split them up using the distributive property

(x+1)(2x-1) = x(2x-1) + 1 (2x-1)

= 2 x^2 - x + 2x - 1

= 2 x^2 + 1x - 1

C) x(x^2+2x-3) -2(x^2+2x-3)

x^3 +2x^2 -3x -2x^2 -4x +6

= x^3 -7x +6

- Math Check -
**Lauren**, Wednesday, April 14, 2010 at 8:04pm
Srry the problem for a is suppose to be 2x(x^2-3x+2) this is my answer

2x^3-6x^2+4x

- Math Check -
**Damon**, Wednesday, April 14, 2010 at 8:07pm
yes

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