Question

√6•√2+√10•√5+√15•√5+√20•√4

Answer 1

=√12+√50+√75+√80=

= 2√3+5√2+5√3+4√5

√a • √b= √a•b

Answer 2

$\sqrt{6} \times \sqrt{2} + \sqrt{10} \times \sqrt{5} + \sqrt{20} \times \sqrt{4}$

$\sqrt{18} + \sqrt{50} + \sqrt{80}$

$3 \sqrt{2} + 5 \sqrt{2} + 2 \sqrt{20}$

$\sqrt{2} (3 + 5 + 2)$

$10 \sqrt{2}$