Question

If g(x) = 2x + 1 and f (x) = x2 + 4, find g[f(4)].
g[f(4)] =

Answer 1

g(f(4)) = 41

Explanation:

Evaluate f(4) then substitute the value obtained into g(x)

f(4) = 4² + 4 = 16 + 4 = 20, then

g(20) = 2(20) + 1 = 40 + 1 = 41

That is g(f(4)) = 41