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Answer:

C. 3x^2 -13x + 7

Step-by-step explanation:

Lets start in the ones place:

   

    +3

 - (-4)

_______

    +7

Now go to the tens place:

   

   -5x

  -(8x)

________

  -13x

Lastly, go to the hundreds place:

   6x^2

  -(3x^2)

_________

   3x^2

So, the correct answer is "3x^2 -13x + 7", which is C.

I hope this helps! :)

 

Answer:

C) 3x squared - 13x + 7

Step-by-step explanation:

To subtract this problem you need to combine like terms

6x squared - 3x squared = 3x squared

-5x - 8x = -13

3 - -4 = 7

Since you combined the like terms put it back into an expression

3x squared - 13x + 7

Since the 13 is negative it becomes a subtraction sign in this expression.

The 7 is positive so it becomes an addition sign.

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