Soit la fonction f(x) = (x - 1) (x - 5)
1. f(8) = (8 - 1) (8 - 5) = 7 * 3 = 21
2. f(-10) = (-10 - 1) (-10 - 5) = -11 * -15 = 165
3. Vraie car f(2) = (2 - 1) (2 - 5) = 2² -10 -2 + 5 = 9 - 12 = -3
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Soit la fonction f(x) = (x - 1) (x - 5)
1. f(8) = (8 - 1) (8 - 5) = 7 * 3 = 21
2. f(-10) = (-10 - 1) (-10 - 5) = -11 * -15 = 165
3. Vraie car f(2) = (2 - 1) (2 - 5) = 2² -10 -2 + 5 = 9 - 12 = -3