factorise X square + X / 4- 1 /8
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x^2 + x/4 -1/8
8x^2 + 2x -1
8x^2 + 4x -2x - 1
4x (2x+1) - 1(2x+1)
(2x+1) (4x-1)
x= -1/2; x= 1/4
8x^2 + 2x -1
8x^2 + 4x -2x - 1
4x (2x+1) - 1(2x+1)
(2x+1) (4x-1)
x= -1/2; x= 1/4
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