Réponse :
bonsoir
Explications étape par étape
(*)= signe multiplié par
A= 3+5*2x+5*1
A=3+10x+5
A=10x+8
B=2x-5(4-3x)
=2x-5*4 -5*-3x
=2x-20+15x
=17x-20
C=(x+2)(5x+3)
=x(5x+3)+2(5x+3)
=5x²+3x+10x+6
=5x²+13x+6
D=(x-7)(5x+2)
=x(5x+2)-7(5x+2)
=5x²+2x-35x-14
=5x²-33x*14
E=(x-1)(x-3)
=x(x-3)-1(x-3)
=x²-3x-(x-3)
=x²-3x-x+3
=x²-4x+3
