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 3 of 3.
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.
Rohi said:
1 decade ago
Just apply (a+b)(a-b) = (a^2-b^2) formula.
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.
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
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