Find the product $(13 + x) (15 - x)$

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Solution

$(13 + x) (15 - x)$

$= 13 (15 - x) + x (15 - x)$

$= 195 ‬ - 13 x + 15 x - x^{2}$

$= 195 + 2 x - x^{2}$

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