Bonjour,
2) Pour x = - 3
D = (x + 5)² - (2x - 7) (x - 5)
D = (- 3 + 5)² - (2 * - 3 - 7) (- 3 - 5)
D = (2)² - (- 6 - 7) (- 8)
D = 4 - (- 13) * (- 8)
D = 4 - 104
D = - 100.
3) Pour x = 5
D = (5 + 5)² - (2 * 5 - 7) (5 - 5)
D = 10² - (7 - 7) (0)
D = 100 - 0 * 0
D = 100.
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Bonjour,
2) Pour x = - 3
D = (x + 5)² - (2x - 7) (x - 5)
D = (- 3 + 5)² - (2 * - 3 - 7) (- 3 - 5)
D = (2)² - (- 6 - 7) (- 8)
D = 4 - (- 13) * (- 8)
D = 4 - 104
D = - 100.
3) Pour x = 5
D = (x + 5)² - (2x - 7) (x - 5)
D = (5 + 5)² - (2 * 5 - 7) (5 - 5)
D = 10² - (7 - 7) (0)
D = 100 - 0 * 0
D = 100.