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= 4x²-4x+1+1
= 4x²-4x+2 --> (diserhanain jadinya dibagi 2)
=2x²-2x+1
(2x-1)^2 + 1
4x^2-4x+1+1
4x^2-4x+2 (bisa disederahanakan, dengan cara dibagi 2)
sehingga hasilnya 2x^2-2x+1