Bonjour :)
Explications étape par étape:
(x + 3 ) ² = x² - 2x
x² +6x + 9 = x² - 2x
x²+ 6x + 9 - x² + 2x = 0
8x = -9
x = -9/8
S = {-9/8}
[tex] \frac {2}{5} x + 8 = \frac {1}{3} x - \frac {7} {3}
[/tex]
[tex] \frac {2}{5} x - \frac {1}{3} x = - \frac {7} {3} - \frac {24} {3} [/tex]
[tex] \frac {1}{15} x = - \frac {31} {3} [/tex]
[tex] 3x = -465 [/tex]
[tex] x = -155 [/tex]
S = { -155 }
