Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 70)
70.
| (489 + 375)2 - (489 - 375)2 | = ? |
| (489 x 375) |
Answer: Option
Explanation:
| Given Exp. = | (a + b)2 - (a - b)2 | = | 4ab | = 4 |
| ab | ab |
Discussion:
6 comments Page 1 of 1.
Jahed Shaikh said:
2 years ago
a = 489
b = 375.
Formula:
(a+b)² = a² + 2ab + b²
(a-b)² = a² - 2ab + b²
So,
(a²+2ab+b²)-(a²-2ab+b²) ÷ a×b.
a²+2ab+b²-a²+2ab-b² ÷ a×b.
2ab+2ab ÷ a×b.
4ab ÷ a×b.
Answer is = 4.
b = 375.
Formula:
(a+b)² = a² + 2ab + b²
(a-b)² = a² - 2ab + b²
So,
(a²+2ab+b²)-(a²-2ab+b²) ÷ a×b.
a²+2ab+b²-a²+2ab-b² ÷ a×b.
2ab+2ab ÷ a×b.
4ab ÷ a×b.
Answer is = 4.
(2)
Shankar said:
3 years ago
Anyone, Please explain the answer in detail.
(2)
S.vinitha said:
5 years ago
Please explain the Answer.
Riba said:
6 years ago
(a+b)^2-(a-b)^2/ab
= a^2+b^2+2ab-(a^2+b^2-2ab)/ab
= a^2+b^2+2ab-a^2-b^2+2ab/ab
= 2ab+2ab/ab
= 4ab/ab
= 4 answer.
= a^2+b^2+2ab-(a^2+b^2-2ab)/ab
= a^2+b^2+2ab-a^2-b^2+2ab/ab
= 2ab+2ab/ab
= 4ab/ab
= 4 answer.
Payal said:
6 years ago
Yes, in please explain the answer in detail.
Atkuri ajay kumar said:
6 years ago
Please explain the answer in detail.
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