Question

f (x)=x2-2x-3 calcular f o f (2)

Answer 1

Reemplazando f(2) =-3
2^2-2(2)-3
-3

Answer 2

fof(x) =  (x² - 2x - 3)² - 2(x² - 2x - 3) - 3

fof(2) = (2² - 2×2 - 3)² - 2(2² - 2×2 - 3) - 3 =
         = (4 - 4 - 3)² - 2(4 - 4 -3) - 3 =
         = (- 3)² - 2(-3) - 3 =
         = 9 + 6 - 3 = 12