bonjour,
2(3x+4)=6x+8
3(-5x-5)=-15x-15
-2(4x-3)=-8x+6
(3x+4)(5+2x)=15x+20+6x²+8x=6x²+23x+20
(6x+3)(x+4)=6x²+3x+24x+12=6x²+27x+12
(-3+5x)(6x-3)=-18x+30x²+9-15x=30x²+3x+9
20x+12y+36z=
je remarque
20=4*5 12=3*4 36=9*4
4(5x+3y+9z)
5x(3-x)+(7+x)(3-x)=(3-x)(5x+7+x)=(3-x)(6x+7)
16-64x²
je remarque
16=4²
64x²=(8x)²
4²-(8x)²=(4+8x)(4-8x)
9x²+6x
9=3*3 6=2*3
3x(3x+2)
36x²-36x+9
je remarque
36x²=(6x)²
9=3²
36x= 2x(6x3)
36x²+36x+9=(6x-3)²
