SOLUTION: Root 20 - root 80 + root 45

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Question 749986: Root 20 - root 80 + root 45
Answer by kibauu(44) About Me  (Show Source):
You can put this solution on YOUR website!
sqrt%2820%29-sqrt%2880%29%2Bsqrt%2845%29=sqrt%284%2A5%29-sqrt%2816%2A5%29%2Bsqrt%289%2A5%29
notice that 4,16 and 9 are quadratic number, you just have to root them
you should have sqrt%285%29