Factorise:
$2 x^{2} + 3 x - 90$

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Solution

$2 x^{2} + 3 x - 90 = 2 x^{2} + 15 x - 12 x - 90 = x (2 x + 15) - 6 (2 x + 15) = (x - 6) (2 x + 15)$

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Factorise:
$\sqrt{2} x^{2} + 3 x + \sqrt{2}$

2 x^{2} - x - 3

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\sqrt{2} x^{2} + 3 x + \sqrt{2}

2 x^{2} + 7 x + 6

{2 x}^{2} + 3 x - 90 = 0

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