Question
Factorise the expressions: $ 7 p^2+21 q^2 $
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Answer
$ 7 p^2+21 q^2 $
$ 7 p^2+21 q^2=7\left(p^2+3 q^2\right) $
$ 7 p^2+21 q^2=7\left(p^2+3 q^2\right) $
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