Question

If x + 1/x = 8 find thre value of x*x+ 1/x*x

Answer 1

x+1/x =8 which gives x+1=8x or x=1/7
so, (1/7*1/7 +1) / (1/7*1/7) gives
(1/49 +1) / (1/49)
or
(1+49/49) / (1/49)
or
(50/49) / (1/49)
which gives 50
Answer=50

Answer 2

(x+1/x)^2=8^2
x^2+1/x^2+2=64
x^2+1/x^2=64-2
x^2+1/x^2=62