maths

factorise completely:xsquared-4x-5

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  1. x^2 - 4x - 5. -5 = 1*(-5). -5+1 = -4 = B.

    x+1 = 0. X = -1.

    x + (-5) = 0. or x-5 = 0. X = 5.

    x^2 - 4x - 5 = (x+1)(x-5).

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