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SSC CGL 2019 PYQ — Question 65

SSC CGL - 11th June 2019 - Shift 2 • Quantitative Aptitude • Q65

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If √x – 1/√x = √6, then x2 + 1/x2 is equal to:

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Correct answer: C

Explanation

Correct answer is option 3 i.e. 62

Concept

Understanding

Application

If √x – 1/√x = a

Then

x + 1/x = a2 + 2 

Given

√x – 1/√x = √6

x + 1/x = 6 + 2 = 8

x2 + 1/x2 = 64 – 2 = 62