SOLUTION: what is -sqrt of 45 minus -5 sqrt of 80

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Question 707127: what is -sqrt of 45 minus -5 sqrt of 80
Answer by unlockmath(1688) About Me  (Show Source):
You can put this solution on YOUR website!
Hello,
Let's rewrite this: -sqrt of 45 minus -5 sqrt of 80 as:
-sqrt 45 - (-5 sqrt 80)
Now we do:
-sqrt 5*9 + 5 sqrt 5*16
Then:
-3 sqrt 5 + 20 sqrt 5
Combine:
17 sqrt 5
Make sense?
RJ
www.math-unlock.com