Bonjour
Résoudre :
5x^2 >> 2x
5x^2 - 2x >> 0
x(5x - 2) >> 0
x = 0 et 5x - 2 = 0
x = 0 et 5x = 2
x = 0 et x = 2/5
x.............|-inf............0..........2/5..........+inf
x.............|........(-)......o...(+)...........(+)..........
5x - 2.....|........(-)...........(-)......o.....(+).........
Ineq......|.........(+).....o....(-).....o.....(+).........
[tex]x \in ]-\infty ; 0] U [2/5 ; +\infty[[/tex]