Respuesta :

(2x−9)(4x+1)  =(2x+−9)(4x+1)  =(2x)(4x)+(2x)(1)+(−9)(4x)+(−9)(1)  =8x^2+2x36x−9  Answer:  8x^234x9
If you add bith of the x's you'll get 6x and if you combine the -9 and +1 you'll get -8 which leaves you with 6x-8