SOLUTION: 9 (rad)20 - 2 (rad)5 could you please help me solve this step by step? thanks!

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Question 122904:

9 (rad)20 - 2 (rad)5
could you please help me solve this step by step? thanks!
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
9sqrt20-2sqrt5
9sqrt(4*5)-2sqrt5
9*2sqrt5-2sqrt5
18-2sqrt5
16sqrt5 answer.