Réponse :
Explications étape par étape
Bonsoir
V : racine de
Vx1 = V(16/25) = 4/5
(x2)^3 = (-10)^3 = (-1000)
1/x3 = 1/0 impossible
(x4)^2 = (V5)^2 = 5
b) 0 << x < 1
Comparer x, x^2, x^3 :
0 << x^2 < 1
0 << x^3 < 1
c) d = x^3 - x
Factoriser d :
d = x(x^2 - 1) = x(x - 1)(x + 1)
x = 0 ou x + 1 = 0 ou x - 1 = 0
x = 0 ou x = -1 ou x = 1
x...........|-inf..........(-1)..........0..........(1).......+inf
x...........|........(-)............(-)....o...(+)........(+).......
x + 1.....|........(-)......o....(+).........(+).......(+).......
x - 1.....|.........(-).............(-)..........(-)...o...(+)......
EQU...|.........(-)......o....(+)...o....(-)....o..(+).......
