Factorise:
$x^{2}+6 \sqrt{6} x+48$
$=x^{2}+4 \sqrt{6} x+2 \sqrt{6} x+48$
$=x(x+4 \sqrt{6})+2 \sqrt{6}(x+4 \sqrt{6})$
$=(x+4 \sqrt{6})(x+2 \sqrt{6})$
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