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September 15th, 2009, 11:52 AM  #1 
Newbie Joined: Sep 2009 Posts: 1 Thanks: 0  Need help with simplifying radicals plezzzz!!!
I have these two equations with radicals that need simplifying but i have no idea where to even begin! Please help me i would really appreciate it!!! and (?(x6)^2)  (?x 6)^2 for the second equation: in the first part the whole thing in parenthesis is in the square root! In the second part only the X is under the square root. Please help I would really appreciate it! Thank you! 
September 15th, 2009, 12:05 PM  #2 
Newbie Joined: Sep 2009 Posts: 9 Thanks: 0  Re: Need help with simplifying radicals plezzzz!!!
I believe you would rationalize the denominator so put the root 7 +3 and switch the sign then times it by all of them

September 20th, 2009, 06:51 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,469 Thanks: 2038 
20/(?7 + 3) = 20(3  ?7)/(3²  7) = 30  10?7 28/?7 = (28?7)/7 = 4?7 Their sum is 30  6?7, i.e., 6(5  ?7). Did you mean ?((x  6)²)  (?x  6)² = x  6  (x  12?x + 36) or did you mean (?(x  6))²  (?x  6)² = x  6  (x  12?x + 36)? 

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