Respostas

2014-02-25T22:22:08-03:00
3x(x+1)-x=33-(x-3)²
3x(x+1)-x=33-x²+6x-9
3x²+3x-x=33-x²+6x-9
4x²-4x-24=0 (:4)
x²-x-6=0
Delta =1+24
Delta =25


x=1±5/2

x'=1+5/2=3
x''=1-5/2=-2

(3,-2)
1 4 1