Réponses

2013-11-17T16:01:34+01:00
(6-x)² - (6-x)(4-x) + 2(36-x²)
=
(6-x)(6-x)-(6-x)(4-x)+2(6-x)(6+x)
=(6-x)(6-x-4+x+12x+2x)
=(6-x)(14x+2)
=2(6-x)(7x+1)