If f(x) = x^2 - 4, then what is f(f(1))?

[riis]

Originally posted by Dilenger4
f(f(1)) --> f(1) = 12 - 4 = 1 - 4 = -3 --> f(f(1)) = (-3)2 - 4 = 9 - 4 = 5 --> 4

5 is the correct answer, but I don't understand why you think it should be 4.