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Solving a Quadratic Equation by Factorization Method

Prove that: ...

Question

Prove that:
$a b - c b + a d - c d$

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Solution

$a b - c b + a d - c d$
$\Rightarrow b (a - c) + d (a - c)$
$\Rightarrow (a - c) (b + d)$ .

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