Evaluate:
$100 x^{2} - 81 y^{2}$

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Solution

$\begin{matrix} 100 x^{2} - 81 y^{2} = {(10 x)}^{2} - {(9 y)}^{2} = (10 x + 9 y) (10 x - (9 y)) M u l t i p l y 9 b y - 1 = (10 x + 9 y) (10 x - 9 y) \end{matrix}$

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