Question

If f(x) = x2 + 1, find f(a + 1).
a2+2
a2+a+1
a2+ 2a + 2

Answer 1

a^2 + 2a + 2

Explanation:

replace x with (a +1) everywhere in the equation

f(a+1) = (a+1)^2 + 1

➡

a^2 + 2a + 1 + 1