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Factorise the expressions x square +x-72 |
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Answer» ===> x² + X - 72 ===> x² + 9x - 8x - 72 ===> x(x + 9) - 8(x + 9) ===> (x + 9)(x - 8) x + 9 = 0 ; x - 8 = 0 ==> x = -9 ; x = 8 |
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