Question

$(2 \sqrt{15} + \sqrt{5)} ( \sqrt{15 } + 3 \sqrt{5)}$
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Answer 1

$= = > \: \: (2 \sqrt{15} + \sqrt{5} )( \sqrt{15} + 3 \sqrt{5} ) \\ \\ = = > \: \: 2 \sqrt{15} \times \sqrt{15} + 2 \sqrt{15} \times 3 \sqrt{5} + \sqrt{15} \times \sqrt{5} + \sqrt{5} \times 3 \sqrt{5} \\ \\ = = > \: \: 2 \times 15 + 2 \times 3 \times \sqrt{25 \times 3} + \sqrt{25 \times 3} + 3 \times 5 \\ \\ = = > \: \: 30 + 6 \times 5 \sqrt{3} + 5 \sqrt{3} + 15 \\ \\ = = > \: \: 30 + 30 \sqrt{3} + 5 \sqrt{3} + 15 \\ \\ = = > \: \: 35 \sqrt{3} + 45$

Answer 2

Answer:

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