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(2x-3)² = (2x)² + 2(2x)(-3) + (-3)²
= 4x² - 12x + 9
cara 2
(2x-3)² = (2x-3)(2x-3) = 4x² - 6x -6x + 9
= 4x² - 12x + 9
(2x-3)(2x-3) = (2x X 2x + 2x X (-3) + (-3) X 2x + (-3) X (-3)) =
4x pangkat 2 + (-6x) + (-6x) + 9
4x pangkat 2 - 6x - 6x + 9
4x pangkat 2 - 12x + 9 = B.