factorise using the method splitting the middle term
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x² -26x +120 = x² - 20x -6x +120
=x(x-20) - 6(x -20)
=(x-20) (x-6)
3x² - 5x -2 =3x² -6x +x -2 = 3x(x-2) + 1(x -2)
=(x-2)(3x+1)
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