Posted by **lisa** on Wednesday, February 20, 2013 at 7:23pm.

what is the sum of (x^2-3x+2) and (5x^2-3x-8)?

how would you solve this???? please help

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**JJ**, Wednesday, February 20, 2013 at 7:26pm
You have to combine like terms.

When you add you keep the variable(letter) with its exponent and and the coefficients (numbers in front)

3x + 5x = 8x

You are going to combine your x^2 terms

your x terms and your constants.

Show me your answer and I will check it.

- math -
**lisa**, Wednesday, February 20, 2013 at 7:32pm
so would it be

7x^2-6??

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**JJ**, Wednesday, February 20, 2013 at 7:34pm
-3x -3x = -6x

this is the same as -3x + -3x + -6x

You are right, but missing the middle term.

-3x + 3x = 0 that isn't what you had here.

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**lisa**, Wednesday, February 20, 2013 at 7:37pm
oh because i thought it was a negative and a positive so they cancel out

but its 7x^2-6x-6? or...?

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**JJ**, Wednesday, February 20, 2013 at 7:44pm
Correct. You have to be careful with the signs.

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**lisa**, Wednesday, February 20, 2013 at 7:45pm
Thank you c:

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**JJ**, Wednesday, February 20, 2013 at 8:07pm
You are welcome.

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