Bonsoir,

A= 14x² -4x +35x -10 + 44x² +8x -33x -6

=?

B= -10x² -4x -20x -8 -( -4x² +5x +12x -15)

= -10x² -4x -20x -8 + 4x² -5x -12x -+5

=?

C= 4x² +20x +25 -( 20x² +8x -15x -6)

= 4x² +20x +25 -(20x² -8x +15x +6

=?

Je te laisse faire les opérations .

A= 14x -4x + 35x -10 + 44x +8x -33x -6

= 64x -16

B= -10x²-4x-20x-8-[-4x²+5x+12x-15]

= -10x²-4x-20x-8+4x²-5x-12x+15

= -6x²-41x+7

C= 4x²+10x+10x+25-20x+8x-15x-6

= 4x²-15x+19

Voilà bonne soirée