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QUESTION
How do you simplify ##sqrt(5)sqrt(15)##?
You could also do either of the following:
##sqrt(5)sqrt(15) = sqrt(5)*sqrt(5*3)=sqrt(5)*sqrt(5)*sqrt(3)=sqrt(25)*sqrt(3)=5sqrt(3)##
##sqrt(5)sqrt(15) = sqrt(5)*sqrt(5)*sqrt(3)=sqrt(25)*sqrt(3)=5sqrt(3)##
