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 3 of 4.
Chandu said:
1 decade ago
@Sameer.
x square = 144.
Then x = square root of 144.
x = 12.
x square = 144.
Then x = square root of 144.
x = 12.
Kavya K said:
1 decade ago
@Sameer, that's not X = square root 128*162.
It should be X^2 = square root 128*162.
= square root 64*2*81*2.
= square root 64*81*4.
= 8*9*2.
X^2 = 144.
=> X = 144/2.
= 12.
It should be X^2 = square root 128*162.
= square root 64*2*81*2.
= square root 64*81*4.
= 8*9*2.
X^2 = 144.
=> X = 144/2.
= 12.
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?
Harshi said:
1 decade ago
Your method is not correct the sqrt of 169 is 13 by your method it is also 12.
Lavanya said:
1 decade ago
Shortcut method is applicable to only number 144 its not applicable to all 3 digit number. Try to give shortcut method to all numbers.
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.
Ravi said:
1 decade ago
@Jiyan prathap.
By using your method find the square root of 196.
By using your method find the square root of 196.
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.
Kalyani said:
1 decade ago
@Jiyan prathap. Can we find square root of all others too by using this method?
Jiyan prathap said:
1 decade ago
There is a short cut to find square root
For Eg: 144 which is the square of 12.
First leave the last two digits of 144. The remaining is 1, 1 comes in 1 table alone.
Hence the first number of the answer is 1.
To find the second digit always add 1 to the first digit of the answer i.e 1+1=2 which is the second digit. Combine together the answer is 12.
For Eg: 144 which is the square of 12.
First leave the last two digits of 144. The remaining is 1, 1 comes in 1 table alone.
Hence the first number of the answer is 1.
To find the second digit always add 1 to the first digit of the answer i.e 1+1=2 which is the second digit. Combine together the answer is 12.
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