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using the factor theorem to show that x-c is a factor of P(X) for the given values of c, and factor

1. P(x)=x3-5x^2+8x-4; c=1

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x^3 -5x^2 +8x -4 = (x-1)(x^2 -4x +4)
= (x-1)(x-2)^2

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