Saved Bookmarks
| 1. |
If the three points (a, 0), (0, b) and (2, 2) are collinear, then show that 1/a + 1/b = 1/2 |
|
Answer» By hypothesis 1/2|a(b - 2) + 0(2 - 0) + 2 (0 - b)| = 0 ⇒ ab -2a - 2b = 0 ⇒ 2a + 2b = ab 1/a + 1/b = 1/2 |
|