Question

find the value of 2 question​

Answer 1

√72x√338 = 156

√45x√20=30

Answer 2

$HEYA \: \\ \\ \sqrt{45} \times \sqrt{20} \\ \\ concept \: \: \: \sqrt{a \times b} = \sqrt{a} \times \sqrt{b} \: \: \\ \sqrt{a {}^{2} } \times \sqrt{b} = a \sqrt{b} \\ a \: and \: b \: belongs \: to \: set \: of \: positive \: real \: numbers \: \: \\ \\ \sqrt{9 \times 5} \times \sqrt{4 \times 5} \\ \\ \sqrt{3 {}^{2} \times 5 } \times \sqrt{2 {}^{2} \times 5 } \\ \\ \sqrt{3 {}^{2} } \times \sqrt{5} \times \sqrt{2 {}^{2} } \times \sqrt{5} \\ \\ 3 \sqrt{5} \times 2 \times \sqrt{5} \\ \\ 6 \sqrt{5} \times \sqrt{5} \\ \\ 6( \sqrt{5} ) {}^{2} \\ \\ 6 \times 5 \\ \\ = 30$