Respostas

2014-08-05T20:47:48-03:00
x²+5x-14=0 
a= 1
b= 5
c= -14
delta= b2 - 4.a.c
delta= 52 – 4.1. (-14)
delta= 25+56
delta= 81
x= -b +- √delta/ 2.a
x= -(5) +- √81/ 2.1
x= -5 +- 9/ 2
x1= -5+9= +4/2 = 2
x2= -5-9= -14/2 = -7