Solve $x^{2} + 5 x - 1800 = 0$

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Solution

$x^{2} + 5 x - 1800 = 0$

$⟹ x^{2} + 45 x - 40 x - 1800 = 0$

$⟹ x (x + 45) - 40 (x + 45) = 0$

$⟹ (x + 45) (x - 40) = 0$

$∴ x = - 45$ or $x = 40$

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