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Question

If x2+1x2=7, then the values of x+1x is
  1. 5
  2. 6
  3. 2
  4. 3

A
5
B
6
C
2
D
3
Solution
Verified by Toppr

Given, x2+1x2=7
Since, (x+1x)2=x2+1x2+2.x.1x
=x2+1x2+2
=7+2
=9
x+1x=3.
Option B is correct.

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