factorise: 7(x-2y)(x-2y)-25(x-2y)+12
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Step-by-step explanation:
7(x - 2y)² - 25(x - 2y) + 12
7(x²-4xy+4y²) -25(x-2y) + 12
7x² - 28xy + 28y² -25x + 50y + 12
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