If $x ^ 2 + 1 / x ^ 2 = 7$ find the value of $x + 1 / x$

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Answer:

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

$(x+1/x)^2=7+2$

$(x+1/x)^2=9$

$x+1/x=\sqrt{9}=3$

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