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skate2400
(6+3√2) (5-2√2) solve?
http://www.wolframalpha.com/input/?i=6%2B3*sqrt%282%29*%285-2*sqrt%282%29%29 15.213
\[6(5-2 \sqrt{2})+3 \sqrt{2}(5- 2 \sqrt{2})=6(5)+6(-2 \sqrt{2})+3\sqrt{2}(5)+3 \sqrt{2}(-2 \sqrt{2})\]
\[30+(-12 \sqrt{2})+15 \sqrt{2}+(-6\cdot2)=30-12 \sqrt{2}+15 \sqrt{2}-12=18+3 \sqrt{2}\]