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- Thread starter pan90
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FOIL it out:How?

Taken from HiSet free practice test

\(\displaystyle ( \sqrt{3} + 2 \sqrt{5} ) ^2 = ( \sqrt{3} + 2 \sqrt{5} ) ( \sqrt{3} + 2 \sqrt{5} )\)

\(\displaystyle = ( \sqrt{3} )^2 + \sqrt{3} \cdot 2 \sqrt{5} + 2 \sqrt{5} \cdot \sqrt{3} + (2 \sqrt{5} )^2\)

Can you finish from here?

-Dan