Pouvez vous maider svp

Bonsoir,

10 (a-b)

5(a+7)

a(7+1)

a( -1 -1) = a( -2)

x( x+3)

x ( 3x+1)

6x -4

5a -2b -10

5x² -2x -7

2x-2 + 15x -21 -3 +3x +10

=  20x -16

x² +3x -10x² +6x  -1 +x -7

= -9x²10x -8