diketahui f (x) = x² + 1 g (x) = x - 4 berapa a. (f o g ) (2) = b. ( g o f ) (-1) =

a.(fog)=(x-4)^2 + 1
maka x^2-8x+16+1
x^2-8x+17. masuk in nilai 2 pada (2)^2-8(2)+17=4-16+17=5

(f o g ) (2) = (x - 4)² + 1
= x² - 8x + 16 + 1
= 2² - 16 + 17
= 5

(g o f ) (-1) = (x² + 1) - 4
= x² + 2x + 1 - 3
= 1 - 2 + 1 - 3
= - 3