X^2-3√5x-20 factorise
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x^2-3√5-20
x^2-4√5x+√5x-20
x(x-4√5)+√5(x-4√5)
(x+√5)(x-4√5)
x=-√5,4√5
x^2-4√5x+√5x-20
x(x-4√5)+√5(x-4√5)
(x+√5)(x-4√5)
x=-√5,4√5
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