Question

If f(x)=4x^2+1 and g(x)=x^2-5 find (f-g)(x)

A. 3x^2+6
B. 3x^2-4
C. 5x^2-4
D. 5x^2-6

Answer 1

It's A 3x^2 + 6.

Explanation:

(f-g)(x) = f(x) - g(x)

= 4x^2 + 1 - (x^2 - 5)

= 4x^2 - x^2 + 1 + 5

= 3x^2 + 6.