Aptitude - Square Root and Cube Root - Discussion

Discussion Forum : Square Root and Cube Root - General Questions (Q.No. 6)
6.

If a = 0.1039, then the value of 4a2 - 4a + 1 + 3a is:

0.1039
0.2078
1.1039
2.1039
Answer: Option
Explanation:

4a2 - 4a + 1 + 3a = (1)2 + (2a)2 - 2 x 1 x 2a + 3a

   = (1 - 2a)2 + 3a

   = (1 - 2a) + 3a

   = (1 + a)

   = (1 + 0.1039)

   = 1.1039

Discussion:
70 comments Page 7 of 7.

Ravi said:   1 decade ago
In the question why he has not taken as 2a-1^2 ?

Joginder said:   1 decade ago
I have the same doubt, why cant it be (2a-1)2.

Barjinder singh said:   9 years ago
Is there any other method to solve it?

Gupta said:   8 years ago
How is it 1-2a? It should be 2a-1.

Pallavi said:   3 years ago
Any anyone explain this clearly.
(2)

Surya said:   6 years ago
Why not 2a-1?

How can 1-2a?

Mithun said:   1 decade ago
sqrt(4a2-4a+1)=2a-1 or 1-2a?

Soumya said:   1 decade ago
Krishna nice explanation.

Amitabha Das said:   7 years ago
It can also be (2a-1)^2.

Ashit patel said:   9 years ago
2a-1=1-2a?


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