Question

If $x ^ 2 + 1 / x ^ 2 = 34$ find the value of $x + 1 / x$

• A. 9
• B. 8
• C. 6
• D. 5

Answer 1

Answer:

C. 6

$(x+1/x)^2=x^2+1/x^2+2$

$(x+1/x)^2=34+2$

$(x+1/x)^2=36$

$x+1/x=\sqrt{36}=6$