E =(2x +5) (3x+7)
=2x*3x+2x*7+5*3x+5*7
=6x²+14x+15x+35
=6x²+29x+35
F= (5x+8) ( 2x-7)
= 5x*2x+5x*(-7)+8*2x+8*(-7)
=10x²-35x+16x-56
= 10x²-19x-56
Je vais faire le reste plus rapidement
M= ( -1,5x -3) ( 4x-0,5 )
=-6x²+0.5x-12x+1.5
=-6x²-11.5+1.5
N= ( 8x-7) ( -7x + 7 )
=-56x²+56x+49x-49
= -56x²+105x-49
VOILA
