Let f(x) =x^2 +2 and g(x)=2x + 1

Find and simplify each of the following bexpressions.

a)...f(4)

b)...g(a+2)

c)...(fog)(2)

1 answer

f(4) ?
just replace the x with 4 in the expressio

g(a+2), same thing, replace x with a+2 in g(x)
= 2(a+2) + 1
= 2a + 5

fog(x) means f(g(x))
so g(2) = 5
then f(5) = 25 + 2 = 27