Répondre :
D= (5x-3)(x+2)-(3-5x)(4+x)
=(5x-3)(x+2+x+4)
=(5x-3)(2x+6)
E=(5+x)(4-x)-8+2x
=(5+x)(4-x)-2(4-x)
=(4-x)(5+x-2)
=(4-x)(x+3)
=(5x-3)(x+2+x+4)
=(5x-3)(2x+6)
E=(5+x)(4-x)-8+2x
=(5+x)(4-x)-2(4-x)
=(4-x)(5+x-2)
=(4-x)(x+3)