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AMPLE13Factorize: (x2-4x)(x2-4x-1)-20

Answer»

(x*x-4x)(x*x-4x-1) - 20 = x*x*x*x - 8x*x*x + 15x*x + 4x - 20 = x*x*x*x - 2x*x*x - 6x*x*x + 12x*x + 3x*x - 6x + 10x - 20 = (x*x*x-6x*x+3x+10)(x-2) = (x*x*x - 2x*x - 4x*x + 8x - 5x + 10)(x-2) = (x*x-4x-5)(x-2)(x-2) = (x-5)(x+1)(x-2)(x-2)



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