SOLUTION: How do you multiply radicals? For example -4radical15 multiplyed by -radical3

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Question 714933: How do you multiply radicals? For example -4radical15 multiplyed by -radical3
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
How do you multiply radicals? For example -4radical15 multiplyed by -radical3
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If by radical you mean square root:
-4sqrt%2815%29%2A%28-1%29sqrt%283%29
Multiply what's outside and what's inside
= 4%2Asqrt%2815%2A3%29+=+4sqrt%2845%29
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= 4sqrt%289%29%2Asqrt%285%29
= 12sqrt%285%29
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The indices have to be the same.
You can't mix square roots and cube roots, eg.