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.
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?
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.
Azam said:
1 decade ago
Short method is that first take LCM of number given then make pairs.
Hammad said:
1 decade ago
We only find the value of x which is equal to 144. But 12 is the square root of 144. If we looking on the question he only demand the value of x which we find initially.
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