f (x) = 2x + 7 g (x) = 5x - 2 Tentukan : a. f (3) b. g (3) c. (fog) (x)

f(x) = 2x+7
f(3) = 2(3) +7 = 6+7 = 13
g(x) = 5x-2
g(3) = 5(3)-2 = 15-2 = 13
fog(x) = f(g(x)) = f(5x-2) = 2(5x-2) + 7 = 10x-4+7 = 10x+3