Archive
20th of March 2017
Mathematics
Q:

If x2 + 1/x2 = 51 then find the x+l/x ?

Vikas Mahajan - CBSE - Class IX

Monday, March 20, 2017 at 15:22:PM

A:

begin mathsize 16px style Given space straight x squared plus 1 over straight x squared equals 51
Adding space 2 space on space both space sides comma space we space get
space straight x squared plus 1 over straight x squared plus 2 equals 51 plus 2
rightwards double arrow open parentheses straight x plus 1 over straight x close parentheses squared equals 53
Taking space square space root space on space both space sides comma space we space get
straight x plus 1 over straight x equals plus-or-minus square root of 53 end style

Monday, March 20, 2017 at 15:30:PM