SOLUTION: How do I simplify this radical expression. -3 Square root of 20 times square root of 15. Also this one. -2 square root of 6a cubed times square root of 3a. Thanks

Algebra ->  Radicals -> SOLUTION: How do I simplify this radical expression. -3 Square root of 20 times square root of 15. Also this one. -2 square root of 6a cubed times square root of 3a. Thanks      Log On


   

Question 152301: How do I simplify this radical expression.
-3 Square root of 20 times square root of 15.
Also this one.
-2 square root of 6a cubed times square root of 3a.

Thanks
Answer by orca(409) About Me  (Show Source):
You can put this solution on YOUR website!
(1)
-3sqrt%2820%29%2Asqrt%2815%29
=-3sqrt%2820%2A15%29
=-3sqrt%284%2A5%2A3%2A5%29
=-3sqrt%282%5E2%2A5%5E2%2A3%29
=-3%2A2%2A5sqrt%283%29
=-30sqrt%283%29
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(2)
-2sqrt%286a%29%2Asqrt%283a%29
=-2sqrt%286a%2A3a%29
=-2sqrt%282%2A3a%2A3a%29
=-2sqrt%282%2A%283a%29%5E2%29
=-2%2A3a%2Asqrt%282%29
=-6a%2Asqrt%282%29