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4x^2 - 2x - 2x + 1
4x^2 - 4x + 1
(2x-1)² = (2x-1)(2x-1)
Kalikan dengan sifat (a+b)(c+d) = ac+ad+bc+bd
Menyebabkan:
(2x-1)² = (2x)(2x) + (2x)(-1) + (-1)(2x) + (-1)(-1)
(2x-1)² = 4x² - 2x - 2x + 1
(2x-1)² = 4x²-4x+1