# math

posted by lisa

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

1. JJ

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

2. lisa

so would it be

7x^2-6??

3. JJ

-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.

4. lisa

oh because i thought it was a negative and a positive so they cancel out

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

5. JJ

Correct. You have to be careful with the signs.

6. lisa

Thank you c:

7. JJ

You are welcome.

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