Verified answer

Bonjour

(X+2)(x+1) = x^2-1

(X+2)(x+1) = (x+1)(x-1)

(X+2)(x+1) -(x+1)(x-1) = 0

(X+1)(x+2-x+1) = 0

(X+1)(3) = 0

X + 1 = 0

X = -1

Verified answer

Bonsoir,

Résoudre l'équation

(x+2)= (x-1)/(x+1)

(x+2)(x+1)= x²-1

x²+2x+x+2= x²-1

x²+3x-x²= -1-2

3x= -3

x= -3/3

x= -1    S= {-1}