Someone help me solve this easy Math task?

label Mathematics
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schedule 1 Day
account_balance_wallet $5

http://i61.tinypic.com/wmxyq.png

Please deduct it and write how you got the answer. Thank you in advance!

Oct 1st, 2015

Thank you for the opportunity to help you with your question!

(10sqrt(5)+3sqrt(5)-7sqrt(5)-8sqrt(7)+3sqrt(7))(8sqrt(5)-2sqrt(5)+6sqrt(7)+2sqrt(7)-3sqrt(7)) = 

one moment please

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 1st, 2015

(10sqrt(5)+3sqrt(5)-7sqrt(5)-8sqrt(7)+3sqrt(7))(8sqrt(5)-2sqrt(5)+6sqrt(7)+2sqrt(7)-3sqrt(7)) = (6sqrt(5)-5sqrt(7))(6sqrt(5)+5sqrt(7)) = 36*5 - 25*7 = 5

Oct 1st, 2015

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