Bonjour
1) Pour x = - 1
A = (2x + 3) (5x - 8)
A = (2 * - 1 + 3) (5 * - 1 - 8)
A = (- 2 + 3) '(- 5 - 8)
A = 1 * - 13
A = - 13
B = (3x - 5)² - 7 (x + 4)
B = (3 * - 1 - 5)² - 7 (- 1 + 4)
B = (- 3 - 5)² - 7 * 3
B = (- 8)² - 21
B = 64 - 21
B = 45
2)
A = (2x + 3) (5x - 8)
A = 10x² - 16x + 15x - 24
A = 10x² + x - 24
B = (3x - 5)² - 7 (x + 4)
B = 9x² - 30x + 25 - 7x - 28
B = 9x² - 37x - 3