Bonsoir,
A=
x² -4x +4 +x² -16
= 2x² -4x -12
B=
10x -2x² +35 -7x -8x -2
= -2x² -5x +33
2/3 -8/15
= 10/15 -8/15 = 2/15
7/3 ( 8/4 -11/4)
= 7/3 * (-3/4)
= -21/ 12
= -7/ 4