Question

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

Answer 1

f(a+1) = a² + 2a + 2

Explanation:

f(x) = x² + 1

f(a+1) means x = a+1

f(a+1) = (a+1)² + 1 = (a+1)(a+1) + 1 = a² + a + a + 1 + 1 = a² + 2a + 2