Bonjour;
a. (2x-3)(x+2)-5(2x-3)
= (2x-3)( x+2-5)
=(2x-3)( x-3)
b. (5x+1)(3x-5)-(x-3)(5x + 1)
= (5x-1) ( 3x-5 -x+3)
=(5x-1)( 2x -2)
c. (3x+2)(-5x-7) - (3x+2)(x+7)
= (3x+2) ( -5x-7 -x-7)
= (3x-2)( -6x -14)
d. (5x-8)(7x-3) - (7x-3)²
=(7x-3)( 5x-8 -7x+3)
=( 7x-3)( -2x -5)
