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Factorisation by Common Factors

ii Factorise ...

Question

Question 3(ii)
Factorise the expressions
$7 p^{2} + 21 q^{2}$

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Solution

$7 p^{2} + 21 q^{2} = 7 \times p \times p + 3 \times 7 \times q \times q = 7 (p^{2} + 3 q^{2})$

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