Réponses

  • Utilisateur Brainly
2013-12-24T13:17:04+01:00
(-7x-6)(x+5)+(8x-9)(2x+10)
=
(-7x-6)(x+5)+2(8x-9)(x+5)
=(x+5)(-7x-6+16x-18)
=(x+5)(9x-24)
2013-12-24T13:18:21+01:00
 (-7x-6)(x+5)+(8x-9)(2x+10) =  (-7x-6)(x+5)+2(8x-9)(x+5)
(x+5)[(-7x-6)+2(8x-9)]
= (x + 5)(9x - 24)
= 3(x +5)(3x - 8)