Question

if x^2+1/x^2=18 find the value of x+1/x​

Answer 1

Answer:2root5

Step-by-step explanation:

X^2+1/x^2=18

Adding 2 to both sides

X^2+1/x^2+2=18+2

(X+1/x)^2=20

X+1/x=under root 20=2root5