SOLUTION: If a = -1 and b=2, then Square root 80a^4b/5b is equal to?

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Question 180663: If a = -1 and b=2, then
Square root 80a^4b/5b is equal to?
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
You really should use parentheses to clearly describe the problem!
Is it: sqrt%2880%28a%5E4%29b%2F5b%29 or sqrt%28%2880a%5E%284b%29%29%2F5b%29 or sqrt%2880%28a%5E4%29b%29%2F5b
Evaluate:
sqrt%2880%28a%5E4%29b%2F5b%29 if a+=+-1 and b+=+2
sqrt%2880%28%28-1%29%5E4%29cross%28%282%29%29%2F5cross%28%282%29%29%29
sqrt%2880%2F5%29
sqrt%2816%29
highlight%284%29 or highlight%28-4%29