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= 2{ (-4a)² - 2(4a)(3b) + (3b)² }
= 2{ 16a² - 24ab + 9b² }
= 32a² - 48ab + 18b²
= 2 (16a^2 + (2×-4a×3b) + 9b^2)
= 2 ( 16a^2 -24ab + 9b^2)
= 32a^2 - 48ab + 18b^2
disederhakan dengan cara sama2 dibagi 2
= 16a^2 -24ab + 9b^2
maaf kalau salah