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Sagot :

Bonjour

a.

f (x) = (x - 1) (11 - x) + 5 (x - 1)²

f (- 3) = (- 3 - 1) (11 - (- 3)) + 5 (- 3 - 1)²

f (- 3) = (- 4) (11 + 3) + 5 (- 4)²

f (- 3) = (- 4) * 14 + 5 * 16

f (- 3) = - 56 + 80 = 24

g (x) = 2 (x - 1) (2x + 3)

g(- 3) = 2 (- 3 - 1) (2 * - 3 + 3)

g (- 3) = 2 * (- 4) * (- 6 + 3)

g (- 3) = - 8 * (- 3)

g(- 3) = 24

f (x) = (x - 1) (11 - x) + 5 (x - 1)²

f (- 2) = (- 2 - 1) (11 - (- 2) + 5 (- 2 - 1)²

f (- 2) = (- 3) * (11 + 2) + 5 * (- 3)²

f(- 2) = - 3 * (13) + 5 * 9

f (- 2) = - 39 + 45

f (- 2) = 6

g (x) = 2 (x - 1) (2x + 3)

g(- 2) = 2 (- 2 - 1) (2 * - 2 + 3)

g(- 2) = 2 (- 3) (- 4 + 3)

g(- 2) = - 6 * (- 1)

g (- 2) = 6

f (x) = (x - 1) (11 - x) + 5 (x - 1)²

f (- 1) = (- 1 - 1) (11 - (- 1)) + 5 (- 1 - 1)²

f (- 1) = - 2 * (11 + 1) + 5 * (- 2)²

f (- 1) = - 2 * 12 + 5 * 4

f (- 1) = - 24 + 20

f (- 1) = - 4

g (x) = 2 (x - 1) (2x + 3)

g ( - 1) = 2 (- 1 - 1) (2 * - 1 + 3)

g(- 1) = 2 * (- 2) * (- 2 + 3)

g (- 1) = - 4 * 1 = - 4

f (x) = (x - 1) (11 - x) + 5 (x - 1)²

f (0) = (0 - 1) (11 - 0) + 5 (0 - 1)²

f (0) = - 1 * 11 + 5 * (- 1)²

f (0) = - 11 + 5

f (0) = - 6

g (x) = 2 (x - 1) (2x + 3)

g (0) = 2 (0 - 1) (2 * 0 + 3)

g(0) = 2 * (- 1) * 3

g(0) = - 2 * 3 = - 6

f (x) = (x - 1) (11 - x) + 5 (x - 1)²

f  (1) = (1 - 1) (11 - 1) + 5 (1 - 1)²

f (1) = 0 * 11 + 5 * 0

f(1) = 0

g (x) = 2 (x - 1) (2x + 3)

g(1) = 2 (1 - 1) (2 * 1 + 3)

g(1) = 2 * 0 * 2 + 3

g (1) = 0

f (x) = (x - 1) (11 - x) + 5 (x - 1)²

f (2) = (2 -1) (11 - 2) + 5 (2 - 1)²

f (2) = 1 * 9 + 5 * 1²

f(2) = 9 + 5

f (2) = 14

g (x) = 2 (x - 1) (2x + 3)

g(2) = 2 (2 - 1) (2 * 2 + 3)

g (2) = 2 * 1 * (4 + 3)

g (2) = 2 * 7 = 14

f (x) = (x - 1) (11 - x) + 5 (x - 1)²

f (3) = (3 - 1) (11 - 3) + 5 (3 - 1)²

f (3) = 2 * 8 + 5 * 2²

f (3) = 16 + 5 * 4

f (3) = 16 + 20 = 36

g (x) = 2 (x - 1) (2x + 3)

g (3) = 2 (3 - 1) (2 * 3 + 3)

g (3) = 2 * 2 * (6 + 3)

g(3) = 4 * 9 = 36.

b. Quel que soit le nombre choisi pour x les fonctions f (x) et g(x) obtiennent toujours le même résultat.

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