Aptitude - Simplification - Discussion
Discussion Forum : Simplification - General Questions (Q.No. 4)
4.
If a - b = 3 and a2 + b2 = 29, find the value of ab.
Answer: Option
Explanation:
2ab = (a2 + b2) - (a - b)2
= 29 - 9 = 20
ab = 10.
Discussion:
107 comments Page 6 of 11.
Antara chatterjee said:
9 years ago
a2 + b 2= 52,and a - b = 2. Then ab?
Anyone solve this problem.
Anyone solve this problem.
Rushah said:
9 years ago
@Antara.
It's very easy. Remove brackets and multiply you got 2ab.
It's very easy. Remove brackets and multiply you got 2ab.
Raj said:
9 years ago
If a + 1/a = 4, then a^2 + 1/a^2 = ?
GH MUSTAFA said:
9 years ago
How can solve this a^2 + b^2 = 16 and (a - b)^2 = 4 then ab is equal to?
John audu said:
9 years ago
@Gh Mustafa
If a ^2+b^2=16 and (a - b)^2 = 4 = (a2 + b2) = 16 (a2 - b2) = 4.
Clear thé bracket = a + b = 16, a - b = 4.
Since we are finding ab = a + b = 16/4 = 4. So, a + b = ab.ab = 4.
If a ^2+b^2=16 and (a - b)^2 = 4 = (a2 + b2) = 16 (a2 - b2) = 4.
Clear thé bracket = a + b = 16, a - b = 4.
Since we are finding ab = a + b = 16/4 = 4. So, a + b = ab.ab = 4.
Nagaraj said:
9 years ago
a^2+b^2 = 29,
a = 5, b = 2.
5^2 + 2^2 = 29.
Thank you.
a = 5, b = 2.
5^2 + 2^2 = 29.
Thank you.
Neeraj Kashyap said:
9 years ago
Please solve the following with explanation:
1. (a + b) (a - b) + (2a + b) (2a - 3b).
2. (x - y)(2x + y) - (x + y)(2x - y).
3. (x + 6){5x - 3(x - 2)}
4. 7x - 3{x - 2x(x - 4)}
1. (a + b) (a - b) + (2a + b) (2a - 3b).
2. (x - y)(2x + y) - (x + y)(2x - y).
3. (x + 6){5x - 3(x - 2)}
4. 7x - 3{x - 2x(x - 4)}
Anil malav said:
9 years ago
(a^2 + b^2)^1/2 = 613 then find the value of a+b.
Solve and find the answer.
Solve and find the answer.
Rah1 said:
9 years ago
Awesome answer @Ram.
Francium said:
9 years ago
Guys, please solve this for me a2 + b2 = 36 and an=7 find the value of (a+b)2.
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