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Simplify (√3 + 2√5)²: Step-by-Step Guide
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FOIL it out:pan90 said:How?
Taken from HiSet free practice test
[math]( \sqrt{3} + 2 \sqrt{5} ) ^2 = ( \sqrt{3} + 2 \sqrt{5} ) ( \sqrt{3} + 2 \sqrt{5} )[/math]
[math]= ( \sqrt{3} )^2 + \sqrt{3} \cdot 2 \sqrt{5} + 2 \sqrt{5} \cdot \sqrt{3} + (2 \sqrt{5} )^2[/math]
Can you finish from here?
-Dan
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