factorise x square - 23 x + 132
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x square - (11+12)x + 132
x square -11x -12x + 132
x(x-11)+12(x-11)
(x-11) (x-12)
x square -11x -12x + 132
x(x-11)+12(x-11)
(x-11) (x-12)
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