grafik f(x)=k×2^x-2 melalui titik (2,3). nilai f(4) adalah...

f(x) = k × 2^(x-2)

3 = k × 2^(2 - 2)
3 = k × 1
3 = k

f(4) = 3 × 2^(4 - 2)
= 3 × 2^2
=12