SOLUTION: I'm having trouble on simplifying radicals, what is negative 2 radical 90?

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Question 1012309: I'm having trouble on simplifying radicals, what is negative 2 radical 90?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
-2 sqrt(90)=
-2 sqrt(10*9)=
-2sqrt (10)*sqrt(9), and sqrt 9=3
-6 sqrt (10). This can't be simplified further.