Aptitude - Square Root and Cube Root - Discussion
Discussion Forum : Square Root and Cube Root - General Questions (Q.No. 2)
2.
| What should come in place of both x in the equation | x | = | 162 | . |
| 128 | x |
Answer: Option
Explanation:
| Let | x | = | 162 |
| 128 | x |
Then x2 = 128 x 162
= 64 x 2 x 18 x 9
= 82 x 62 x 32
= 8 x 6 x 3
= 144.
x = 144 = 12.
Discussion:
35 comments Page 4 of 4.
Proek said:
1 decade ago
-12 is the valid answer too!
Sumi said:
1 decade ago
Is there any short tricks to find square root and cube root ?
Kumari said:
1 decade ago
@sreedevi,
Thanks for tip.
But,I think it is bit difficult to get this correctly.
Mostly we need to think in terms of squares and then look for which one will give 162
Thanks for tip.
But,I think it is bit difficult to get this correctly.
Mostly we need to think in terms of squares and then look for which one will give 162
Sreedevi said:
1 decade ago
You can see that 162 is divisible by 9.i.e.(1+6+2)=9 which is a multiple of 9.so it makes calculation easier if one factor is a perfect square. You can split 162 as 81*2 also where 81 is a perfect square.
S.ramkumar said:
1 decade ago
You split 162=18*9 how we can understand this because there are so many possibles are there to split 162 and how we can find this exact split.
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