Respostas

A melhor resposta!
  • Usuário do Brainly
2014-07-09T19:47:12-03:00
Y=x²-5x+4

x²-5x+4=0
Δ=b²-4ac
Δ=25-16
Δ=9
√Δ=3

x'= \frac{5+3}{2} = \frac{8}{2} =4

x"= \frac{5-3}{2} = \frac{2}{2} =1

S={1,4}
4 4 4