Bonjour;
A = x(5x-1)-3x²+3-2(3x²-x+4)
=5x² -x -3x² +3 -6x² +2x -8
= -4x² +x -5
C=2(x-3)-(2x+1)+3(5-2x)
= 2x -6 -2x -1 +15 -6x
=-6x +8
B=-3x(1-2x)-5(-2-x)-2(x² - 1)
=-3x +6x² +10 +5x -2x²+2
= 4x² +2x +12
-
D = 5x2 3x(9-4x) + (8x-7)
= 5x² -27x +12x² +8x -7
= 17x² -19x -7