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 3 of 5.
BFC said:
7 years ago
How to solve 4th step the denominator (3+2√2) (3-2√2)? Please explain.
Shaya said:
4 years ago
For what reason we are multiplying 3-2 √x / 3-2 √x? Please explain me.
Mahima said:
8 years ago
4th step how to solve the denominator (3+2√2)(3-2√2)? Please explain.
Sefah said:
1 decade ago
How do we get the square in the 1st step because it wasn't part of the question?
Srinivas said:
10 years ago
4th step is the problem. Where did the denominator go. No proper explanation.
Ravi said:
1 decade ago
How the value of the (3-2 2)(3+2 2)=1?
Here "2 2" means what ?
Here "2 2" means what ?
Rishu Raj said:
3 years ago
@All.
Here, basically the value of X = 3+2✓2. Is a square of (✓2+1) ^2.
Here, basically the value of X = 3+2✓2. Is a square of (✓2+1) ^2.
(3)
Mohan said:
6 years ago
@Joe.
In the first step, it is in the form of (a-b) ^2 formula.
In the first step, it is in the form of (a-b) ^2 formula.
Gayathri said:
1 decade ago
Here given 'x' value only not root 'x'. So answer is 2(1+root2).
Obentulu said:
3 years ago
From the first step, how 2 come? Someone explain this better.
(1)
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