1. jika f(x) = x^2 + 1 maka f(f(x)) 2. jika f(x - 5) = x^2 + 2 maka f(2)

jawab

1)
f(x) = x²  + 1
f{ f(x)} = f (x² +1) = (x² +1)² + 1
= x⁴ + 2x² + 1  + 1
= x⁴ + 2x² + 2

2)
f(x -5) = x² + 2
f(2) = ...
x - 5 = 2
x = 7

f(2) = (7²) + 2 = 49 + 2
f(2) = 51