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ditanyakan f(2), berasal dari x=1, maka x diganti 1
f(1+1) =1² - 3
f(2) = 1 - 3
f(2) = -2
x+1 = 2
x = 1
pilih x = 1 maka
f(1+1) = 1²-3
f(2) = 1-3
f(2) = -2 jawab c