Sagot :
Bonjour,
a) 3x-4x(2-2x)+2x²
3x -8x +8x² +2x²
=10x² -5x
b) (4x+6)(4x-6)+36-2x
= 16x² -24x +24x-36 +36 -2x
= 16x² -2x
c) (3x+4)²+12+3x
= 9x² +24x +16 +12 +3x
= 9x² +27x +28
d) 4(2x+4)+x(2-3x)
= 8x +16 +2x -3x²
=-3x² +10x +16
e) (3+5 x)(5x-3)+(5x-3)²
15x -9 +25x² -15x + 25x² -30x +9
= 50x² -30x
Explications étape par étape :
b = 2 ((2x+3 )*(4x-6)+18-x
=2(8x²-12x+12x-18+18-x)
=2x(8x-1)
c=6x+8+12+3x
=9x+8+12
=9x+20
d=8x+16+2x+3x²
=-3x²+10x+16
e=(5x-3)(3+5x+2)
=(5x-3)(5+5x)
=(5x-3)*5(1+x)
=5(5x-3)(1+x)
