Saved Bookmarks
| 1. |
if are in AP, then x is equal to |
|
Answer» Value of x is EITHER - ⅔ or + 1 Step-by-step EXPLANATION: In an A.P., the comman difference is always same. → 9x² - 1 = d → 4x + 21 - 3x² - 14 = d → - 3x² + 4x + 7 = d Since both equations have same R.H.S. → - 3x² + 4x + 7 = 9x² - 1 → 0 = 12x² - 4x - 8 On factorising, → 0 = 12x² - 12x + 8x - 8 → 0 = 12x(x - 1) + 8(x - 1) → 0 = (12x + 8)(x - 1) Each getting zero, → x = - ⅔ and + 1 |
|