SOLUTION: Please help... sqrt63 - 2sqrt28 + 5sqrt7 These are so confusing for me.

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Question 104980: Please help...
sqrt63 - 2sqrt28 + 5sqrt7
These are so confusing for me.
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
sqrt63=sqrt9*7=3sqrt7
2sqrt28=2sqrt4*7=2*2sqrt7=4sqrt7
3sqrt7-4sqrt7+5sqrt7=4sqrt7 answer.