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Factorise into quadratics
X^2-4x-21
X^2-4x+3
X^2+9x-36
1 answer
X^2-4x-21
(x+3)(x-7)
X^2-4x+3
(x -1)(x-3)
X^2+9x-36
(x +12)(x-3)
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