Factorise the following expression
$49 y^{2} + 84 y^{2} + 36 z^{2}$

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Solution

$\begin{matrix} 49 y^{2} + 84 y z + 36 z^{2} 49 y^{2} + 42 y z + 42 y z + 36 z^{2} 7 y (7 y + 6 z) + 6 z (7 y + 6 z) (7 y + 6 z) (7 y + 6 z) . \end{matrix}$

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