Factorise into single brackets: 7y2-21y, 7(y2-3y), 7y(y-3), y(72-21), y2(7-21), Difference of two squares: x2-25, (x+5)(x-5), (x+5)(x+5), (x-5)(x-5), (x-5)(-x+5), Factorising monic quadratics : x2+6x+8, (x2-4)(x+3), (x+2)(x-4), (x-2)(x-4), (x+2)(x+4), Factorising non-monic quadratics : 6x2-5x-4, (2x+1)(3x-4), (x+1)(5x+4), Solving quadratic equations: x2+6x+8=0, x=-2 x=4, x=-2 x=-4, x=4 x=3, x=-4 x=-3.

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