Find the sum.

(-3x^4 - 9x^3 - 4x^2 + 4) + (8x^3 - 7x^3 - x - 6)

O A.) - 3x^4 + x^3 - 4x^2 - x - 2

O B.) 3x^4 + x^3 - 4x^2 - x - 2

O C.) - 3x^4 - 8x^3 - 4x^2 - x - 2

O D.) 3x4^4 - x^3 - 4x^2 - x - 2

I'm try to solve this but don't know how to ... 2/3x=-12

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