;f(3)=18 carilah f(x)

f(3) = 18

f(3) = 3 + 15 → f(x)=x+15

f(3) = 2(3) + 12 → f(x)=2x+12

f(3) = 3(3) + 9 → f(x)=3x+9

f(3) = 3² + 9 → f(x)=x²+9

f(3) = 2×3² → f(x)=2x²

•and more•