Bonjour;
A=
2-1+4x -2 -4x +12
= 11
B=
10x² +5x -6x -3 +21 -3x-28x +4x²
= 14x² -32x +18
C =
-9x +2x² +54 -12x +21 -42x
= 2x² -63x +75
D =
9x-3 -4-2x -5x +7
= 2x
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Verified answer
Bonjour;
A=
2-1+4x -2 -4x +12
= 11
B=
10x² +5x -6x -3 +21 -3x-28x +4x²
= 14x² -32x +18
C =
-9x +2x² +54 -12x +21 -42x
= 2x² -63x +75
D =
9x-3 -4-2x -5x +7
= 2x