bonsoir
3 x² - 5 x = 3 x - 4
- 2 est t - il solution ?
3 ( - 2 )² - 5 * - 2 = 3 * - 2 - 4
12 + 10 = - 6 - 4
22 ≠ - 10
2 /3 est t il solution ?
3 ( 2/3)² - 5 * 2/3 = 3 * 2/3 - 4
3* 4/9 - 10 /3 = 6/3 - 4
12/9 - 10 /3 = 6/3 - 4
12/9 - 30/9 = 18/9 - 36 /9
- 18/9 = - 18/9
( x + 11 )² = x² + 22 x + 121
aire AEFG = x²
aire ABCD = ( x + 11 )² = x² + 22 x + 121
aire colorée = x² + 22 x +21 - x² = 22 x + 21
22 x + 21 = 341
22 x = 341 - 21
22 x = 320
x = 320/22 = 160/11
