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SSC CGL 2018 PYQ — Question 15

SSC CGL Tier II Quant - 09/03/2018 • Quantitative Aptitude • Q15

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If  then what is the value of ?

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Correct answer: D

Explanation

The correct option is 4.

or, 

or, 

or, 

or, 

or, 

or,  ............. (1)

Now,

or, x2 − 2x − 1 = 2

or, x = 

Lets consider positive root value for x.

And, 

So, 

Now, 

or, 

or, 

or, 

D is correct choice.