Jika f(x) = 2x²-4x,maka f (x-2)=
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f(x-2) = 2(x-2)^2 - 4(x-2)
= 2(x^2 - 4x + 4) - 4(x-2)
= 2x^2 - 8x + 8 - 4x + 8
= 2x^2 - 12x + 16
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