A=3x(2-8x)
= 6x -24x²
B=5 (4x-9)-7x(2+9x)
= 20x -45 -14x -63x²
= -63x² +6x -45
C=9-8x²-3(2x²-11)+7x(5+7x)
= 9-8x² -6x² +33 +35x +49x²
= 35x² +35x +42
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Bonjour;
A=3x(2-8x)
= 6x -24x²
B=5 (4x-9)-7x(2+9x)
= 20x -45 -14x -63x²
= -63x² +6x -45
C=9-8x²-3(2x²-11)+7x(5+7x)
= 9-8x² -6x² +33 +35x +49x²
= 35x² +35x +42