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 5 of 11.
Venkat@rockzzzz said:
9 years ago
(a-b)^2 = a^2+b^2-2ab.
2ab = a^2+b^2-(a-b)^2,
= 29-3^2,
= 29-9,
2ab = 20.
ab =10.
2ab = a^2+b^2-(a-b)^2,
= 29-3^2,
= 29-9,
2ab = 20.
ab =10.
Venkat@rockzzzz said:
9 years ago
(a-b)^2 = a^2+b^2-2ab.
2ab = a^2+b^2-(a-b)^2,
= 29-3^2,
= 29-9,
2ab = 20.
ab =10.
2ab = a^2+b^2-(a-b)^2,
= 29-3^2,
= 29-9,
2ab = 20.
ab =10.
Govind said:
8 years ago
If a+b+c=0 then {(a^2 + b^2 + c^2)^2} / {(a^2 * b^2) + (b^2 * c^2) + (c^2 * a^2)}.
Harsh singh said:
9 years ago
Yes @Bonjor.
(a+b)2 = (a-b)2+4ab,
(a+b)2 = 256,
a+b = +-16.
+-16 is the answer.
(a+b)2 = (a-b)2+4ab,
(a+b)2 = 256,
a+b = +-16.
+-16 is the answer.
Gyanika said:
9 years ago
Can somebody please solve this question.
a - b = 1, 2a + 20 = b. Then a, b is?
a - b = 1, 2a + 20 = b. Then a, b is?
Francium said:
9 years ago
Guys, please solve this for me a2 + b2 = 36 and an=7 find the value of (a+b)2.
Imane said:
8 years ago
What about if its: find the value of a and b and we have just a+b=2 and ab=-5?
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.
MBA P said:
8 years ago
If a * b = 3a - 2b.
Find (4*2)*7 WHAT DOES THIS MEAN?
EXPLAIN ME PLEASE.
Find (4*2)*7 WHAT DOES THIS MEAN?
EXPLAIN ME PLEASE.
Raman deep said:
8 years ago
If (2-a+b, b)=(6, 2), then find the value of a and b. Can anyone solve this?
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers