Respostas

  • Usuário do Brainly
2014-06-08T21:47:15-03:00
Y= (2+3x)(4x-2)
8x -4+12x² -6x=0

12x² +2x -4=0  :(2)
6x² +x -2=0
Δ=1+48
Δ=49        √Δ=7

x=( -1 -7)/12=- 8/12= -4/3
x= (-1 +7)/12=  6/12 = 1/2

S= {-4/3,1/2}