Question

if x-1/x=5 and x^2+1/x^2=7, find x+1/x​

Answer 1

Answer:

x2 + 1/x2 = 7

=> (x + 1/x)2 - 2 = 7

=> (x + 1/x)2 = 9

=> x + 1/x = root over 9

=> x + 1/x = +- 3

Please remember to write +-3 when you do square root in this case....