Question

Factorise:

$7 \sqrt{2} x { {}^{2} } - 10x - 4 \sqrt{2}$
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Answer 1

$7 \sqrt{2} x { {}^{2} } - 10x - 4 \sqrt{2} \\ 7 \sqrt{2} {x}^{2} - 14x + 4x - 4 \sqrt{2} \\ 7 \sqrt{2} x( x - \sqrt{2} ) + 4(x - \sqrt{2} ) \\ (7 \sqrt{2} x + 4)(x - \sqrt{2} )$