Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

If  x4 +\(\frac{1}{{x}^{4}}\) = 9602

find the value of x - \(\frac{1}{x}\)

Options:

2\(\sqrt {6}\)

4\(\sqrt {6}\)

6\(\sqrt {6}\)

7\(\sqrt {6}\)

Correct Answer:

4\(\sqrt {6}\)

Explanation:

x4+\(\frac{1}{{x}^{4}}\) = 9602

x2+\(\frac{1}{{x}^{2}}\) =\(\sqrt {9602+2}\)=98

[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-\(\frac{1}{x}\) = \(\sqrt {98-2}\)=\(\sqrt {96}\)

x-\(\frac{1}{x}\) =4\(\sqrt {6}\)