Question 152301
(1)
{{{-3sqrt(20)*sqrt(15)}}}
={{{-3sqrt(20*15)}}}
={{{-3sqrt(4*5*3*5)}}}
={{{-3sqrt(2^2*5^2*3)}}}
={{{-3*2*5sqrt(3)}}}
={{{-30sqrt(3)}}}
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(2)
{{{-2sqrt(6a)*sqrt(3a)}}}
={{{-2sqrt(6a*3a)}}}
={{{-2sqrt(2*3a*3a)}}}
={{{-2sqrt(2*(3a)^2)}}}
={{{-2*3a*sqrt(2)}}}
={{{-6a*sqrt(2)}}}