Respostas

2014-06-03T23:53:02-03:00
X²-9x+14=0 
delta= -9² -4 .1.14
= 81 + (-56)
= 25
x= -(-9) +- raiz de 25 /2.1
x= 9 +- 5 /2
x'= 9+5/2 = 14/2 = 7
x''= 9-5/2 = 4/2 = 2 
4 3 4