Kak tolong bantuin jawabb ,samaa caranyaa jugaaa yaaa ')
makasiii ^^
makasiii ^^
a. f(x) = 3/5(2x-7)
= 6x/5 -21/5
misal f(x) = y
y = 6x/5 - 21/5 ------- kedua ruas kalikan 5
5y = 6x - 21
6x = 5y + 21
x = 5/6y + 7/2
f^(-1) (x) = 5/6x + 7/2
b. f^(-1) (3) = (5/6)×3 + 7/2
= 5/2 + 7/2 = 6
c. f^(-1) (9) = (5/6)×9 + 7/2
= 15/2 + 7/2
= 22/2 = 11
