Aptitude - Simplification - Discussion
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Read more:"Everything should be made as simple as possible, but not simpler."
- Albert Einstein
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| 14. |
| (469 + 174)2 - (469 - 174)2 |
= ? |
| (469 x 174) |
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| [A]. |
2 | [B]. |
4 | | [C]. |
295 | [D]. |
643 |
Answer: Option D
Explanation:
| Given exp. = |
(a + b)2 - (a - b)2 |
| ab |
= 4 (where a = 469, b = 174.)
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Naddy said:
(Sat, Jan 15, 2011 08:45:39 AM)
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=[(a+b)^2-(a-b)^2]/ab
=[(a2+b2+2ab)-(a2-b2-2ab)]/ab
=4ab/ab,
where as a^2 and b^2 will get cancelled as both are in oppoaite signs
=4 |
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Kavi said:
(Thu, Dec 29, 2011 05:32:38 PM)
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| How 4ab/ab come? |
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