Réponse :
Explications étape par étape
Bonsoir
Factoriser :
0 = (x2 + x)(x - 2) + (x + 1)(x+3)
x(x + 1)(x - 2) + (x + 1)(x + 3) = 0
(x + 1)[x(x - 2) + x + 3] = 0
(x + 1)(x^2 - 2x + x + 3) = 0
(x + 1)(x^2 - x + 3) = 0
P=2(49 - 81x²) + (7x -9)(7 + 9x)
P = 2(7 - 9x)(7 + 9x) + (7x - 9)(7 + 9x)
P = (7 + 9x)[2(7 - 9x) + 7x - 9]
P = (7 + 9x)(14 - 18x + 7x - 9)
P = (7 + 9x)(-11x + 5)
