Question

x+1/x=5 then find x^2-1/x^2 in short method

Answer 1

Answer:

• (x+1/x) =5
• (x+1/x) ^2=25
• x^2+1/x^2+2*x*1/x=25
• x^2+1/x^2+2=25
• x^2+1/x^2=25-2=25 Is answer