Solve the equation : $3 x^{2} + 15 x - 72$

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Solution

$3 x^{2} + 15 x - 72 = 0$

$x^{2} + 5 x - 24 = 0$

$x^{2} + 8 x - 3 x - 24 = 0$

$x (x + 8) - 3 (x + 8) = 0$

$(x + 8) (x - 3) = 0$

$x = - 8, 3$

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3 x^{2} + 15 x - 72

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