Question

if x^(2)+1/x^(2)=18 find the answer of x+1/x​

Answer 1

Answer:

x^2+1/x^2=18

=> (x+1/x)^2-2.x.1/x=18

=> (x+1/x)^2-2=18

=> (x+1/x)^2=18+2

=> (x+1/x)^2=20

=> x+1/x=√20

=> x+1/x=2√5

so,

x+1/x=2√5