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Factorisation by Common Factors

Factorise the...

Question

Factorise the following expression.
$q^{2} - 10 q + 21$

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Solution

Now,
$q^{2} - 10 q + 21$
$= q^{2} - 7 q - 3 q + 21$
$= (q - 3) (q - 7)$ .

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