Respostas

2014-04-28T16:28:33-03:00
-x+4x-3=0
Δ=4²-4.(-1).(-3)
Δ=16-12
Δ=4
x=-(-6)±√4/2.-1

x'=6+2/-2
x'=-4
x"=8-2/-2
x"-3

{-4,-3}