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 2 of 4.
Sameer said:
1 decade ago
X = square root 128*162
= square root 64*2*81*2
= square root 64*81*4
= 8*9*2 = 144
Why answer is showing 12?
= square root 64*2*81*2
= square root 64*81*4
= 8*9*2 = 144
Why answer is showing 12?
Govind said:
1 decade ago
The above said method is easy to find. Because we can split the no by using the square values we know.
Pradeep said:
1 decade ago
128*162 = 20736.
Now find the square root by long division method.
Square root = 144.
Thus x = 12.
Now find the square root by long division method.
Square root = 144.
Thus x = 12.
Peka said:
5 years ago
X^2 = √128x√162
X^2 = 8√2x9√2
X^2 = 72x2
X^2 = 144
X = √144.
X = 12.
X^2 = 8√2x9√2
X^2 = 72x2
X^2 = 144
X = √144.
X = 12.
(5)
Apeksha said:
8 years ago
x^2 = root of 128 * 162.
= root of 20736.
x^2 = 144,
x = root of 144,
x = 12.
= root of 20736.
x^2 = 144,
x = root of 144,
x = 12.
Feroz said:
10 years ago
@Jiyan prathap.
This is not working to roots I thinks so but it useful for me.
This is not working to roots I thinks so but it useful for me.
Kalyani said:
1 decade ago
@Jiyan prathap. Can we find square root of all others too by using this method?
Harshi said:
1 decade ago
Your method is not correct the sqrt of 169 is 13 by your method it is also 12.
VIVEK said:
6 years ago
If I use 81 *2 in place of 162 then? In 81 *2, 81 is also a perfect square.
(1)
Azam said:
1 decade ago
Short method is that first take LCM of number given then make pairs.
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