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
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