Réponse :
bonsoir
3
a (4x-8)-(3x-7)+(-2x+3)=
4x-8-3x+7-2x+3=
-x+2
b (6x²-5x+7)-(4x²-5x-5)=
6x²-5x+7-4x²+5x+5=
2x²+12
c -(3x²-5x+2)+(2x²-2x+8)-(3-2x+2x²)=
-3x²+5x-2+2x²-2x+8-3+2x-2x²=
-3x²+5x+3
4
a(4x+5)(3x+2)=12x²+8x+15x+10=12x²+23x+10
b (5x-2)(x+7)=5x²+35x-2x-14=5x²+33x-14
c (4x-3)(5x-2)=20x²-8x-15x+6=20x²-23x+6
5
(6x-4)-(2x-8)=6x-4-2x+8=8x+4
(6x-4)(2x-8)=12x²-48x-8x+32=12x²-56x+32
(6x-4)+(2x-8)=6x-4+2x-8=8x-12
6x-4(2x-8)=6x-8x+32=-2x+32
6
(x-5)(3x+5)+(4x-2)(5x-2)=
3x²+5x-15x-25+20x²-2x-10x+4=
23x²-22x-21
(3x+2)(2x-5)-(6x-5)(4x+2)=
6x²-15x+4x-10-24x²-12x+20x+10=
-18x²-3x
(4x-5)(2x-5)-(4x+1)(2x-3)=
8x²-20x-10x+25-8x²+12x-2x+3=
-20x+28
7
7x²-4x+8
7×3²-4×3+8=63-12+8=59
7×(-4)²-4×(-4)+8=112+16+8=136
7×(-3)²-4×(-3)+8=63+12+8=83
Explications étape par étape
