B)
1.
0 0.5 1 1.5 2 2.5 3 3.5 4
1 -0.75 -2 -2.75 -3 -2.75 -2 -0.75 1
2. (piece jointe)
3. x = 0.25 ou x = 3.75
C)
1. a)
(2 + V3)² = 4 + 4V3 + 3 = 7 + 4V3
b)
f(2+V3) = 7+4V3 -8 - 4V3 + 1 = 0
2.
(2-V3)² = 4 - 4V3 + 3 = 7 - 4V3
f(2-V3) = 7-4V3 - 8 + 4V3 + 1 = 0