Bonjour, voici mes réponses :
A = 3t² +6t -8
A = 3×3² +6×3 -8
A = 27 +18 -8
A = 37
B = 5x² -3x +7
B = 5×(-2²) -3×(-2) +7
B = -20 +6 +7
B = -7
C = -3y² -5y -8
C = -3×(-3²) -5×(-3) -8
C = 27 +15 -8
C = 34
