Question

1) a) 5√•√6+√2•√15=?
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Answer 1

$\sqrt{5} \times \sqrt{6} + \sqrt{2} \times \sqrt{15} = \\ = \sqrt{5} \sqrt{6} + \sqrt{2} \times \sqrt{15} = \\ = \sqrt{5 \times 6} \times \sqrt{2 \times 15} = \\ = \sqrt{30} + \sqrt{30} = \\ = 2 \sqrt{30}$