jika fungsi f (x- 4) = 2x + 9, maka f (x) adalah ... #Pakai Caranya ...

f(x-4) = 2x + 9
f(x-4) +4 = (2x + 9) +4
f(x) = 2x + 13

Misal :
x - 4 = a
x = 4 + a

f(x - 4) = 2x + 9
f(a) = 2(4 + a) + 9
f(a) = 8 + 2a + 9
f(a) = 2a + 17
f(x) = 2x + 17