Aptitude - Surds and Indices - Discussion
Discussion Forum : Surds and Indices - General Questions (Q.No. 15)
15.
| If x = 3 + 22, then the value of |  |
x | - | 1 |  |
is: |
| x |
Answer: Option
Explanation:
|
x | - | 1 | |
2 | = x + | 1 | - 2 |
| x | x |
| = (3 + 22) + | 1 | - 2 |
| (3 + 22) |
| = (3 + 22) + | 1 | x | (3 - 22) | - 2 |
| (3 + 22) | (3 - 22) |
= (3 + 22) + (3 - 22) - 2
= 4.
 |
|
x | - | 1 | |
= 2. |
| x |
Discussion:
48 comments Page 2 of 5.
Abisheak said:
6 years ago
Where is the power 2 comes from in the starting stage? We can See that there is no power mentioned in the question.
Harigovind C B said:
8 years ago
if a÷b=4÷5 and b÷c=15÷16 , then (c^2-a^2)÷c^2+a^2 is equal to?
Can anyone solve this?
Can anyone solve this?
Shahid said:
1 decade ago
Convert the expression x into (a+b)^2 form
with a=squareroot(2) and b=1
and then after that try it
with a=squareroot(2) and b=1
and then after that try it
Raja raviteja said:
9 years ago
^2 = 1.414.
3 + 2^2 = 5.828. Where ^x = ^5.818 = 2.414.
So, ^x - 1/^x = 2.414 - (1/2.414) = 2 =>answer.
3 + 2^2 = 5.828. Where ^x = ^5.818 = 2.414.
So, ^x - 1/^x = 2.414 - (1/2.414) = 2 =>answer.
Vicky said:
1 decade ago
Question is to find (x^1/2 - 1/x^1/2).
Then why there is square in the explanations first line.
Why?
Then why there is square in the explanations first line.
Why?
Rakshith said:
6 years ago
@Abisheak.
We have taken that power to get the equation and rooted in the final to get the answer.
We have taken that power to get the equation and rooted in the final to get the answer.
(1)
Bishal Dey said:
8 years ago
= 3+2√2 + 1/3+2√2 -2,
= 3+2√2 + 3 - 2√2 -2,
=6-2.
=4.
=√4=2.
= 3+2√2 + 3 - 2√2 -2,
=6-2.
=4.
=√4=2.
Varun said:
1 decade ago
Question is to find (x^1/2 - 1/x^1/2)
Then there is square in the explanations first line.
Then there is square in the explanations first line.
Swetha said:
1 decade ago
Can anyone please explain whole sum clearly how -2 came in the 2nd step of the sum?
Milind said:
7 years ago
(√x-1/√) -2 = (x + 1/x) - 2.
Can you tell me where this -2 comes from?
Can you tell me where this -2 comes from?
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