Explications étape par étape:
A=(x-3)(2x+1)
=2x²+x-6x-3
=2x²-5x-3
B=(3-3x)(5x+5)
=15x+15-15x²-15x
=-15x²+15
C=(1-4x)(-10x-9)
=-10x-9+40x²+36x
=40x²+26x-9
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Explications étape par étape:
A=(x-3)(2x+1)
=2x²+x-6x-3
=2x²-5x-3
B=(3-3x)(5x+5)
=15x+15-15x²-15x
=-15x²+15
C=(1-4x)(-10x-9)
=-10x-9+40x²+36x
=40x²+26x-9