jika f:R dan f(x-3)=6x-15,maka f(x)=

misal f(x) = ax + b
maka
f(x - 3) = a(x - 3) + b
6x - 15 = ax - 3a + b
ax = 6x
a = 6
dan
- 3a + b = - 15
- 3(6) + b = -15
-18 + b = -15
b = 3

f(x) = 6x + 3