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x+1 = p
x = p - 1
f (p) = x²-3
(p-1)²-3
(p²-2p+1)-3
p²-2p+1-3
p²-2p-2
jadi f (x) = x²-2x-2
f(2) = 2²-2.2-2
4-4-2 = -6