Question 73433
{{{ -3sqrt(20) * sqrt(15) }}}
Since you are multiplying, you can combine your square roots right away
{{{ -3sqrt(20*15) }}}
Break the 20 and the 15 up into Prime factors
{{{ -3sqrt(2*2*5*5*3) }}}
Since we are doing square roots, we pull numbers out from under the radical in pairs, but only one stays.
{{{ -3(2)(5)sqrt(3) }}}
Multiply the co-efficients
{{{ -30sqrt(3) }}}
You were right!!