Aptitude - Square Root and Cube Root - Discussion
Discussion Forum : Square Root and Cube Root - General Questions (Q.No. 9)
9.
The square root of (7 + 35) (7 - 35) is
Answer: Option
Explanation:
| (7 + 35)(7 - 35) | = | (7)2 - (35)2 | = 49 - 45 = 4 = 2. |
Discussion:
24 comments Page 1 of 3.
Amu said:
1 decade ago
(a+b)(a-b) = a^2-b^2
So ans must be 4 What is the necessity to take square root?
Please explain me.
So ans must be 4 What is the necessity to take square root?
Please explain me.
Siri said:
1 decade ago
Here square root is already there. so, a+b * a-b = a2-b2. so, square root a2-b2. so answer is 2 only
Jony singla said:
1 decade ago
No answer is 4 because they can't mention square root whole number, they are only mention the square root is root 5 not to 7 or 3.
Rohi said:
1 decade ago
Just apply (a+b)(a-b) = (a^2-b^2) formula.
MANJU said:
1 decade ago
This question is in (a-b)(a+b) form. So we can simplify as a^2-b^2.
So, 7^2 - (9*5) = 49-45 = 4.
So, 7^2 - (9*5) = 49-45 = 4.
S.ramu said:
1 decade ago
Just applying the formula (a+b)*(a-b) = a^2-b ^2.
Keshav kumar mishra said:
1 decade ago
The question is in the form of (a+b)(a-b) and
So that,
7*7 = 49.
49-45 = 4.
So that,
7*7 = 49.
49-45 = 4.
Rachana said:
1 decade ago
Correct Answer is 2 (because question about square root not square) :).
Joe said:
1 decade ago
Am confuse if (7)^2 = 49 then how possible (35)^2=45?
Selvi said:
9 years ago
As per my knowledge, the answer should be 4.
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