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my best choice would be C. i may be wrong but do the math again.
biancamagallanez
the answer is C.

if f(x)= 2x^2+1 and g(x)=x^2-7, (f+g)(x) is

(2x^2+1)+(x^2-7)=

combine like terms so,
(f+g)(x)=3x^2-6

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