Réponse :
a)g(4) = 2 × 4² + 7/4 - 12
=2 × 16 + 7/4 - 48/4
=32 - 41/4
=128/4 -41/4
=87/4
b)g(-2) = 2 × (-2)² + (-7/2) - 12
=2 × 4 - 7/2 - 24/2
=8 - 31/2
=16/2 - 31/2
= - 15/2
c)g(-1/2) = 2 × (-1/2)² + (7/-1/2) - 12
= 2 × 1/4 + 7×(-2/1) - 12
= 2/4 + (-14) -12
= 1/2 -26
= 1/2 - 52/2
= -51/2
Explications étape par étape