sir tommorow exam

Asked by pranavjain | 5th Mar, 2010, 03:44: PM

Expert Answer:

x = (7 + 6)/(7 - 6)

Rationalize,

x = (7 + 6)2/(7 - 6) = 7 + 242 + 6 = 13 + 242

x2 = 169 + 5242 + 168 = 337 + 5242

(x + 1/x)2 = x2 + 2 + 1/x2

= 337 + 5242 + 2 + 1/(337 + 5242)

Rationalize the last term,

= 337 + 5242 + 2 +  (337 - 5242)

= 676

Regards,

Team,

TopperLearning.

Answered by  | 5th Mar, 2010, 09:59: PM

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