49x² - 112 * x * y + 64y² = (7x)² - 2 * 7x * 8y + (8y)² = (7x - 8y)² =
= (7x - 8y)(7x - 8y)
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49x² - 112 * x * y + 64y² = (7x)² - 2 * 7x * 8y + (8y)² = (7x - 8y)² =
= (7x - 8y)(7x - 8y)
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