Respostas

2013-07-30T11:10:04-03:00
Delta=(-9)²-4.-1.-18
Delta=81-72
Delta=9


X=-(-9)±raiz quadrada de 9
-----------------------------
2.-1

X=9±3 12
-----
-2

X¹=9+3
---- = ---- =-6
-2 -2

X²= 9-3 6
--- = ----- = -3
-2 -2