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Factorise x3 + 13 x2 + 32x + 20 |
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Answer» X^3 + 13x^2 + 32x + 20 = x^3 + x^2 + 12x^2 + 12x + 20X + 20 = x^2 ( x + 1) +12x ( x + 1) + 20(x +1) = (x+1)(x^2 + 12x + 20 = ( x + 1 ) [ x^2 + 10X + 2X + 20] = (x+1) [ x(x+10) + 2 (x+10)] = (x+1)(x+2)(x+10) |
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