Question

dada f (x)=3 - 4x, calcule f (a+1) y f (a), f (1)

Answer 1

solamente sustituimos los valores:
f (x) = 3 - 4x

f (a + 1) = 3 - 4(a + 1) = 3 - 4a -4
f (a + 1) = -1 - 4a

f(a) = 3 - 4a

f(1) = 3 - 4(1)
f(1) = -1