-4y(15x+12y-8z)(x-2y)
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Answer:
5(x - 2y)² - 8(x - 2y) - 16
Let (x - 2y) = m
15m² - 8m - 16
= 15m² - 20m + 12m - 16
= 5m( 3m - 4) + 4( 3m - 4)
= (5m + 4)(3m - 4)
now, put m = (x - 2y)
= {5(x - 2y) + 4}{3(x - 2y) - 4}
={5x - 10y + 4}{3x - 6y - 4}
=(5x - 10y + 4)(3x - 6y - 4)
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