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justicehall2002

Since you're finding the sum (adding) all you have to do is combine like terms.

5x ² is by itself because there is no other term with x²

3x and 12x because they have an x

-7 and 12 because they're normal coefficients

Then you're left with 5x² + 15x + 5, answer choice A

Answer:

  5x² + 3x - 7 + 12x + 12 = 5x² + 15x + 5

So here we have 3x and 12x, you can see that they have the common factor which is x, so you keep x and add 3 and 12 and we have 15x. For the numbers just calculate as usual. What you have 5x² left, there is no number to subtract or add with it so it will remain unchanged.

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