Respuesta :

choixongdong
f(x) = x^2 + 1, find f(a + 1)
so
 f(a + 1) = (a+1)^2 +1
 f(a + 1) = a^2 + 2a + 1 + 1
 f(a + 1) = a^2 + 2a + 2