facrorise 3x^2+60x-288
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x² + 20x - 96
x = {-20 ± √[400 - 4 (-96)] }/ 2
x = ( -20 ± 4 )/2
x = (-20 + 4)/2 or (-20 - 4)/2
x = -16/2 or -24/2
x = -8 or -12
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