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f(1)=4
f(x+1) = 2f(x)
untuk
x = 1, maka f(1+1) = 2f(x) ---> f(2) = 2.f(1) = 2.4 = 8
x = 2, maka f(2+1) = 2.f(2) = 2.8 = 16
x = 3, maka f(3+1) = 2.f(3) = 2.16 = 32
x = 4, maka f(4)=f(3+1)= 32
x = 5, maka f(4+1) = 2 f(4) = 2. 32 = 64
x = x+4, maka f(x+3+1)= 2 f(x+3)
= 2 f(x+2+1)= 2 . 2 f(x+2) = 2.2. f(x+1+1)
= 2.2.2 f(x+1) = 2.2.2.2 f(x)