Réponse :
Bonjour
Explications étape par étape
Exercice 6)
1) A = 5(3x - 2)
A = 5*3x - 5*2
A= 15x - 10
B = (x+3)(x-7)
B= x*X- 7*x + 3*x - 7*3
B= x^2 - 7x + 3x -21
B = x^2-4x-21
2) a) pour x = 2
C = 5(3x-2)-(x+3)(x-7)
C = 5(3*2-2)-(2+3)(2-7)
C = 5(6-2)-(5)*(-5)
C = 5*4 + 25
C = 20 + 25
C = 45
b)
C = 5*3x-2*5-(x*x-7*x+3*x-7*3)
C = 15x - 10 -(x^2-7x+3x-21)
C = 15x - 10 - x^2 + 7x - 3x +21
C = -x^2 +19x + 11
c)
C = -2^2 + 19*2 +11
C = -4 + 38 + 11
Reposte le 1ere exercice
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Réponse :
Bonjour
Explications étape par étape
Exercice 6)
1) A = 5(3x - 2)
A = 5*3x - 5*2
A= 15x - 10
B = (x+3)(x-7)
B= x*X- 7*x + 3*x - 7*3
B= x^2 - 7x + 3x -21
B = x^2-4x-21
2) a) pour x = 2
C = 5(3x-2)-(x+3)(x-7)
C = 5(3*2-2)-(2+3)(2-7)
C = 5(6-2)-(5)*(-5)
C = 5*4 + 25
C = 20 + 25
C = 45
b)
C = 5(3x-2)-(x+3)(x-7)
C = 5*3x-2*5-(x*x-7*x+3*x-7*3)
C = 15x - 10 -(x^2-7x+3x-21)
C = 15x - 10 - x^2 + 7x - 3x +21
C = -x^2 +19x + 11
c)
C = -x^2 +19x + 11
C = -2^2 + 19*2 +11
C = -4 + 38 + 11
C = 45
Reposte le 1ere exercice