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Sagot :

1) (3x(-2)) au carre-5x(-2)+6
=-6au carre +10+6
=36+10+6
=46+6
=52
1). A=3X(-2^2)-5X(-2)+6
A=12+10+6
A=28

2). B=-5b^2+6b+8b^2-3-8b+9
B=3b^2-2b+6

C=-3X5y-2y+4
C=-15y-2y+4
C=-17y+4

3). D=3(2x-5)-(x-9)+4x
D=6x-15-x+9+4x
D=9x-6

4). E=(4x+3) (2x+5)
E=8x^2+20x+6x+15

F=(2x-3) (3x+2)
F=6x^2+4x-9x-6

remarque : ^2 = au carré

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