If $x^4 + \frac{1}{x^4} = 1154, x > 0 $, then what will be the value of $x + \frac{1}{x} $ ?
Answer & explanation
Correct answer: option 4
We know that,
If x4 + \(\frac{1}{x^4}\) = a
then x2 + \(\frac{1}{x^2}\) = \(\sqrt {a + 2}\) = b
and x + \(\frac{1}{x}\) = \(\sqrt {b + 2}\)
If $x^4 + \frac{1}{x^4} = 1154, x > 0 $,
then x2 + \(\frac{1}{x^2}\) = \(\sqrt {1154 + 2}\) = 34
then the value of $x + \frac{1}{x} $ = \(\sqrt {34 + 2}\) = 6