Respuesta :

Answer:

           f(a+1) = a² + 2a + 2

Step-by-step 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