Add $4 \sqrt{3}+2 \sqrt{5}$ and $6 \sqrt{3}-4 \sqrt{5}$.
Add $4 \sqrt{3}+2 \sqrt{5}$ and $6 \sqrt{3}-4 \sqrt{5}$.
$(4 \sqrt{3}+2 \sqrt{5})+(6 \sqrt{3}-4 \sqrt{5})$
$=(4 \sqrt{3}+6 \sqrt{3})+(2 \sqrt{5}-4 \sqrt{5})$
$=(4+6) \sqrt{3}+(2-4) \sqrt{5}$
$=10 \sqrt{3}-2 \sqrt{5}$
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