Factorise : $x^{2} - x - 72$

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Solution

$x^{2} - x - 72 = x^{2} - 9 x + 8 x - 72 = x (x - 9) + 8 (x - 9) = (x - 9) (x + 8)$

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x^{2} - x - 72

Factorise Completely : $3 x^{2} + 15 x - 72$

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x^{2} + \frac{1}{x^{2}} + 2 - 3 x - \frac{3}{x} .

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