factorise ( x^2 - 4x ) (x^2 -4x -1) - 20
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Step-by-step explanation:
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Answer:
4x^x+2x-20
Step-by-step explanation:
(x^2-4x)(x^2-4x-1)-20
(2x-4x)(2x-4x-1)-20
(-2x)(-2x-1)-20
4x^x+2x-20
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