Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

If the value of x4+\(\frac{1}{{x}^{4}}\) = 2207

than what is the value of this equation decreased to single power and divided by four.

Options:

17

\(\frac{17}{2}\)

\(\frac{7}{4}\)

\(\frac{9}{4}\)

Correct Answer:

\(\frac{7}{4}\)

Explanation:

If x4+\(\frac{1}{{x}^{4}}\) = 2207

x2+\(\frac{1}{{x}^{2}}\) = \(\sqrt{2207+2}\) = 47   [If x4+\(\frac{1}{{x}^{4}}\) = m than x2+\(\frac{1}{{x}^{2}}\) = \(\sqrt {{m}^{}+2}=z\) and x+\(\frac{1}{x}\)=\(\sqrt{{z}^{}+2}\)]

x+\(\frac{1}{x}\) = \(\sqrt{47+2}\) = 7

x+\(\frac{1}{x}\) = 7

\(\frac{x+\frac{1}{x}}{4}\) = \(\frac{7}{4}\)