factorise x2 +1 /6x -1 /6
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X2+1/6x-1/6
multiply the whole eqn. by 6 then,
6x2+x-1
6x2-2x+3x-1 (splitting the middle term)
2x(3x-2)+1(3x-1)
(2x+1)(3x-1)
factors are (2x+1) and (3x-1)
value for X is -1/2 and +1/3
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