Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

If x + \(\frac{1}{x}\) = 12

then find the value of  ( (x)2 + (\(\frac{1}{x}\))2 + 17)

Options:

160

159

157

170

Correct Answer:

159

Explanation:

⇒ If x + \(\frac{1}{x}\) = a then ( (x)2 + (\(\frac{1}{x}\))2 ) = a2 - 2

Here,

x + \(\frac{1}{x}\) = 12, then 

⇒ ( (x)2 + (\(\frac{1}{x}\))2 + 17 ) = 122 - 2 + 17   = 159