Question

For f(x)=2x^2+1 and g(x)= x^2-7, find (f+g)(x)

A. x^2-6

B. x^2+8

C. 3x^2-6

D. 3x^2+8

Answer 1

`f(x)=2x^2+1;\ g(x)=x^2-7\\\\(f+g)(x)=f(x)+g(x)=(2x^2+1)+(x^2-7)\\\\=2x^2+1+x^2-7=(2x^2+x^2)+(1-7)\\\\Answer:\ \boxed{C.\ 3x^2-6}`