diketahui f(×+2)=2×maka f(4)

- Fungsi -

f(x+2) = 2x
misalkan, u = x+2
x = u-2

maka,
f(u) = 2(u-2)
f(u) = 2u-4
f(x) = 2x-4
f(4) = 2(4)-4
f(4) = 8-4 = 4

semoga membantu
-vin

[tex]f(x + 2) = 2x \\ f(2 + 2) = 2(2) \\ f(4) = 4[/tex]