Question

Factorise (x 2 -2x) 2 -2(x 2 -2x)-3

Answer 1

let  z = x² - 2x

then F = z² - 2 z - 3
           = (z - 3) (z + 1) 
           = ( x² - 2x - 3) (x² - 2x + 1)
           = (x -3 ) (x + 1) (x - 1)²

Answer 2

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