Respuesta :

Answer: Choice A is correct

Explanation:

The x^2 terms add to -x^2+4x^2 = 3x^2

The x terms add to x+(-x) = x-x = 0x = 0

The constant -1 doesn't have anything to pair with it, so it just stays as is.

So overall we end up with 3x^2-1

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