Question

If f(x) = 3x² + 1 and g(x) = 1 - X, what is the value of (f -9)(2)?

Answer 1

(f -g)(2) = 14

Explanation:

You can write the expression for the composite function as ...

(f -g)(x) = f(x) -g(x) = (3x² +1) -(1 -x)

(f -g)(x) = 3x² +x

Then for x = 2 ...

(f -g)(2) = 3(2²) +2

(f -g)(2) = 14