Question
Expand the following product.
 (–5a + b) (c + d)

Answer

$(-5 a+b)(c+d)$
$\begin{array}{l}=(-5 a+b) c+(-5 a+b) d \\ =-5 a c+b c-5 a d+b d \\ =-5 a c-5 a d+b c+b d .\end{array}$

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