Question

if x+1/x=20,find the value of x2+1/x2​

Answer 1

Answer:

Step-by-step explanation:

x + 1/x = 20

Squaring both sides,

(x + 1/x)^2 = 400

x^2 + 1/x^2 + 2 = 400

x^2 + 1/x^2 = 398