Réponse:
g(x)= x (4x-1)
g(2)= 2 (4×2-1)=2×7 = 14
g (0)= 0 × (4×0-1) = 0
g (-3)= -3 (4×(-3)-1)= -3 (-12-1)= -3×(-13)=39
g (1/2)= 1/2 (4×1/2-1) = 1/2 (2-1) = 1/2
