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Bukti :
(a - 2b) (a + 2b)
= a² + 2ab - 2ab - 4b²
= a² - 4b²
Pake rumus: (a - b)² jika difaktorkan menjadi a² - 2ab + b²
(a - 4b)²
= a² - 2(a)(4b) + 4b²
= a² - 8ab + 16b²
Salam..
Moga suksess ^^