Question

If f(x) = 2x² + 5 and g(x) = x² - 2, find

(f- g)(x).

A. 3x² +7
B. 3x2 + 3 C. x² +7
D. x² +3

Answer 1

C. x² + 7

Explanation:

If f(x) = 2x² + 5 and g(x) = x² - 2, then

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

= (2x² + 5) - (x² - 2)

= 2x² + 5 - x² + 2

= 2x² - x² + 5 + 2

= x² + 7