diketahui f(x-2)=3x+1 jadi rumus fungsi f(x+2)?

Misal x-2 = a maka x = a+2
f(a) = 3(a+2) + 1 = 3a+6+1 = 3a + 7
f(x) = 3x + 7
Lanjut
f(x+2) = 3(x+2) + 7 = 3x+6+7 = 3x + 13