Sagot :
Développer , réduire et ordonner les expressions suivantes :
A =(5x + 3)(7+4x)
=35x+20x²+21+12x
=20x²+47x+21
B =(5x + 7)(2x - 5) -(4x - 3)(2x - 1)
=10x²+14x-25x-35-(8x²-6x-4x+3)
=10x²-11x-35-8x²+10x-3
=10x²-x-38
A =(5x + 3)(7+4x)
=35x+20x²+21+12x
=20x²+47x+21
B =(5x + 7)(2x - 5) -(4x - 3)(2x - 1)
=10x²+14x-25x-35-(8x²-6x-4x+3)
=10x²-11x-35-8x²+10x-3
=10x²-x-38