Question

Given f, of, x, equals, minus, 4, x, minus, 5f(x)=−4x−5, find f, of, 5f(5).

Answer 1

f(x) = −4x − 5.
f(5) = −4(5) − 5 = −20 − 5 = −25.
5f(5) = 5(−25) = −125.
f(5f(5)) = f(−125) = −4(−125) − 5 = 500 − 5 = 495.

Answer: 495.