bonsoir,
A = 2 +3 (5x –1)-(7x –2)
= 2 + 15x -3 -7x +2=
8x +1
B = 4x(3-x)-52x? +1)
inexact
C =(2x-9) (9+5x)-(10x² +3x – 4)
18x +10x² -81 -45x -10x² -3x +4=
-30x -77
D=8(-2x-3)-(x-6)(5x+4).
-16x -24 -(5x² +4x -30x -24)=
-16x -24 -5x² -4x +30x +24=
-5x² +10x