Sagot :
A= (x-5)(3-2x)
=3x-15-2x²+10x
=-2x²+13x-15
B=(3x+5)au carré -2(15x+9)
=9x²+30x+25-30x-18
=9x²+7
A= (x-5)(3-2x)
=3x-2x²-15+10x
=-2x²+13x-15
B=(3x+5)²-2(15x+9)
=9x²+30x+25-30x-18
=9x²+7
=3x-2x²-15+10x
=-2x²+13x-15
B=(3x+5)²-2(15x+9)
=9x²+30x+25-30x-18
=9x²+7