Réponse :
Explications étape par étape
Bonjour
Developper :
B = -3/2(x - 7)^2 - (x - 3)^2(x - 5)
B = -3/2(x^2 - 14x + 49) - (x^2 - 6x + 9)(x - 5)
B = -3/2 x^2 + 21x - 147/2 - (x^3 - 5x^2 - 6x^2 + 30x + 9x - 45)
B = -3/2 x^2 + 21x - 147/2 - x^3 + 11x^2 - 39x + 45
B = -x^3 + 22/2 x^2 - 3/2 x^2 - 18x - 147/2 + 90/2
B = -x^3 + 19/2 x^2 - 18x - 57/2
C = (x^2 - 2x + 1)(x + 1) - (x + 5)(7x - 4)
C = x^3 + x^2 - 2x^2 - 2x + x + 1 - (7x^2 - 4x + 35x - 20)
C = x^3 - x^2 - x + 1 - 7x^2 - 31x + 20
C = x^3 - 8x^2 - 32x + 21
