Question

x-1/x =7 find the value of x2 +1/x2

Answer 1

if x-1/x=7 then2x+1/2x=2

Answer 2

here x+1/x= 7
squaring both side
(x+1/x)^2= (7)^2
x^2+1/x^2-2x*1/x=49
x^2+1/x^2=49+2
x^2+1/x^2=51