Sagot :
Réponse :
ex 1 :
5(x+3) = 20
5x + 15 = 20
5x = 5
x = 1
1/2x + 2 = -3/2x + 8
4/2x = 6
2x = 6
x = 3
(x + 3)(x - 4) = (x - 3)(x + 4)
x^2 - 4x + 3x - 12 = x^2 + 4x - 3x - 12
-2x = 0
x = 0
2(x + 3) = (2x - 3)5
2x + 6 = 10x - 15
-8x = -21
x = 2,625
Bonjour,
Résoudre deux équations parmi les équations suivantes /
(x + 3)(x – 4) = (x - 3)(x + 4)
x²+3x-4x-12= x²-3x+4x-12
x²-x-12= x²+x-12
x²-x-12-x²-x+12= 0
-2x= 0
x= 0
S= { 0 }
5(x + 3) = 20
5x+15= 20
5x= 20-15
x= 5/5
x= 1
S= { 1 }
2(x + 3) = (2x - 3)5
2x+6= 10x-15
2x-10x= -15-6
-8x= -21
x= 21/8
S= { 21/8 }