multiply (√3 +√2) and (2√5+7√3)
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\begin{gathered}( \sqrt{3} + \sqrt{2} ) \times (2 \sqrt{5} - 7 \sqrt{3} ) \\ \\ = \sqrt{3} \times (2 \sqrt{5} - 7 \sqrt{3} ) + \sqrt{2} \times (2 \sqrt{5} - 7 \sqrt{3} ) \\ \\ = 2 \sqrt{15} - 21 + 2 \sqrt{10} - 7 \sqrt{6} \\ \\ = 2( \sqrt{15} + \sqrt{10} ) - 7 ( \sqrt{6} + 3)\end{gathered}(3+2)×(25−73)=3×(25−73)+2×(25−73)=215−21+210−76=2(15+10)−7(6+3)
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