Factorise
$2 a^{2} + 10 a - 28 = 0$

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Solution

$\begin{matrix} 2 a^{2} + 10 a - 28 = 0 2 a^{2} + 14 a - 3 a - 28 = 0 2 a (a + 7) - 4 (a + 7) = 0 (2 a - 4) (a + 7) = 0 (2 a - 4) (a + 7) = 0 2 a - 4 = 0 a = 2 o r a = 7 A n s . \end{matrix}$

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