Aptitude - Square Root and Cube Root - Discussion

Discussion :: Square Root and Cube Root - General Questions (Q.No.13)

13. 

3 - 1 2 simplifies to:
3

[A].
3
4
[B].
4
3
[C].
4
3
[D]. None of these

Answer: Option C

Explanation:

3 - 1 2 = (3)2 + 1 2 - 2 x 3 x 1
3 3 3

= 3 + 1 - 2
3

= 1 + 1
3

= 4
3


Munna said: (Mar 22, 2011)  
Good caluclation.

Abhilash said: (Jan 31, 2014)  
By doing LCM b/w root3 and 1/root3 also we can get that easily.

Kalaiarasi said: (Nov 27, 2014)  
How to calculate LCM?

Amit said: (Feb 20, 2015)  
It is (a-b)square = (a square+b square-2ab).

Joslin said: (Apr 5, 2015)  
Taking LCM.

= (sqrt3- 1/sqrt3)^2.
= ( (3-1)/sqrt3)^2.
= (2/sqrt3)^2.
= 4/3.

Joha said: (Feb 19, 2016)  
Any one please explain this sum?

Simi said: (Mar 24, 2016)  
Use the formula:

(a-b)^2 = a^2 + b^2 - 2(a*b).

Yash Badgujar said: (Jul 15, 2016)  
= sqrt3/1 - 1/sqrt3.
= sqrt9 - 1/sqrt3.
= (3 - 1/sqrt3)^2.
We know that,
(a/b)^2 = a^2/b^2.
so,
= (2^2)/(sqrt3^2).
= 4/sqrt9.
= 4/3.

Aswin said: (Jul 26, 2018)  
In this sum, why don't we use BODMAS condition?

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