Question

5. Let f(x) = x - 2 and g(x) = x^2. Find the value of (g of)(4).

A.14
B.4
C. 62
D.32

Answer 1

B. 4

Explanation:

(g o f)(x) means that we put the expression for f(x) in for x in g(x):

(g o f)(x) = g(f(x)) = (x - 2)²

We want to find (g o f)(4), so plug 4 in for x:

(g o f)(x) = (4 - 2)² = 2² = 4

The answer is thus B.

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