bonjour
A = x² + 3 x + 4 x + 12 = x² + 7 x + 12
B = 2 y² + 8 y + 6 y + 24 = 2 y² + 14 y + 24
C = 15 z + 18 z² + 20 + 24 z = 18 z² + 39 z + 20
D = 21 t + 35 t² + 24 + 40 t = 35 t² + 61 t + 24
