factorise x^2+2√3-24
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x²-2√3x-24
=x²-4√3x+2√3x-24
=x(x-4√3)+2√3(x-4√3)
=(x-4√3)(x+2√3)
=(x+2√3)(x-4√3)
=x²-4√3x+2√3x-24
=x(x-4√3)+2√3(x-4√3)
=(x-4√3)(x+2√3)
=(x+2√3)(x-4√3)
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