find the value

Asked by  | 4th Sep, 2012, 08:41: PM

Expert Answer:

Answer : To find : the value of (1/(5-2root3)) + (1/(5+2root3))
 
(1/(5-2root3)) + (1/(5+2root3))
taking the lcm , we get
=(5+ 2root3 + 5 -2root3 ) / ((5-2root3)(5+2root3))
= 10 / (52 - ( 2root3)2 ) {using (a+b)(a-b)= a2- b2}
=10 / (25 - 12)
=10/13 Answer 

Answered by  | 4th Sep, 2012, 11:53: PM

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