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(x±a)(x±b) = x²±(a+b)x+ab.

81 x2-64 y2

Question

81x² $-$ 64y²

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Solution

$81 x^{2} - 64 y^{2} = {(9 x)}^{2} - {(8 y)}^{2} = (9 x + 8 y) (9 x - 8 y)$

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(x±a)(x±b) = x²±(a+b)x+ab.

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