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 2 of 3.
Anil said:
9 years ago
3√3 * (4) how to solve this?
Please help me.
Please help me.
Swathi said:
9 years ago
Please solve this question in the easy way of method.
Shilpa sudhan said:
9 years ago
@Joe.
(3R5)^2 = 3 to the power 2 and root 5 to the power 2 root 5 to the power 2 can be written as root 5 into root 5 which is equal to 5 now we get 3^2 * 5 = 45.
(3R5)^2 = 3 to the power 2 and root 5 to the power 2 root 5 to the power 2 can be written as root 5 into root 5 which is equal to 5 now we get 3^2 * 5 = 45.
(1)
Pradhi said:
9 years ago
The answer should be 4 only. There is no whole square root is given in question.
Selvi said:
9 years ago
As per my knowledge, the answer should be 4.
Joe said:
1 decade ago
Am confuse if (7)^2 = 49 then how possible (35)^2=45?
Rachana said:
1 decade ago
Correct Answer is 2 (because question about square root not square) :).
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.
S.ramu said:
1 decade ago
Just applying the formula (a+b)*(a-b) = a^2-b ^2.
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.
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