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Résoudre :

(15 - 5x)(x + 1) > 0

15 - 5x = 0

15 = 5x

x = 15/5

x = 3

x + 1 = 0

x = -1

x..........|-inf............(-1)............3............+inf

15-5x..|........(+)..............(+).....o....(-).........

x+1......|........(-)........o.....(+)...........(+)........

Ineq..|..........(-).......||......(+).....||.....(-).......

(2x + 4)(3x - 3) 0

2x + 4 = 0

2x = -4

x = -4/2

x = -2

3x - 3 = 0

3x = 3

x = 3/3

x = 1

x...........|-inf...........(-2)...............1............+inf

2x+4....|........(-).......o......(+)..........(+)........

3x-3.....|........(-)................(-)......o...(+)........

Ineq....|.........(+)......o.......(-)......o...(+).......