Sagot :
Bonjour,
A=(5-x)(8x-6)
= 40x -30 -8x² +6x
= -8x² +46x -30
B=(2x+3)(5x-9)
= 10x² -18x +15x -27
= 10x² -3x -27
C=(4+x)(2-x)+(x+3)(2x+4)
= 8 -4x +2x -x² + 2x² +4x +6x +12
= x² +8x +20
Bonjour,
A=(5-x)(8x-6)
= 40x -30 -8x² +6x
= -8x² +46x -30
B=(2x+3)(5x-9)
= 10x² -18x +15x -27
= 10x² -3x -27
C=(4+x)(2-x)+(x+3)(2x+4)
= 8 -4x +2x -x² + 2x² +4x +6x +12
= x² +8x +20