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simplify  

(3x2+9x-1)+(-5x2+6x-10)

 

A. 8𝑥2 − 3𝑥 + 9

B. −2𝑥2 − 3𝑥 + 9

C. 8𝑥2 + 15𝑥 − 11

D. −2𝑥2 + 15𝑥 − 11

Guest Aug 29, 2017

Best Answer 

 #1
avatar+7067 
+3

   (3x2 + 9x - 1) + (-5x2 + 6x - 10)

 

We can get rid of the parenthesees since there is only addition between them.

=  3x2 + 9x - 1 + -5x2 + 6x - 10

 

Now we can rearrange the terms so like terms are together.

=  3x2 - 5x2 + 9x + 6x - 1 - 10

 

Combine like terms. Just like  3 apples - 5 apples = -2 apples ....so does  3x2 - 5x2 = -2x2

=      -2x2     +  15x        - 11

hectictar  Aug 29, 2017
 #1
avatar+7067 
+3
Best Answer

   (3x2 + 9x - 1) + (-5x2 + 6x - 10)

 

We can get rid of the parenthesees since there is only addition between them.

=  3x2 + 9x - 1 + -5x2 + 6x - 10

 

Now we can rearrange the terms so like terms are together.

=  3x2 - 5x2 + 9x + 6x - 1 - 10

 

Combine like terms. Just like  3 apples - 5 apples = -2 apples ....so does  3x2 - 5x2 = -2x2

=      -2x2     +  15x        - 11

hectictar  Aug 29, 2017

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