Factorise:
$x^{2}-2 \sqrt{3} x-24$
$=x^{2}-4 \sqrt{3} x+2 \sqrt{3} x-24$
$=x(x-4 \sqrt{3})+2 \sqrt{3}(x-4 \sqrt{3})$
$=(x-4 \sqrt{3})(x+2 \sqrt{3})$
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