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Multiplication of Any Polynomial

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Question

Multiply : $(x - 4) (x + 5)$ .

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Solution

$(x - 4) (x + 5)$
$= x (x + 5) - 4 (x + 5)$
$= x^{2} + 5 x - 4 x - 20$
$= x^{2} + x - 20$

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