Respostas

2014-04-24T22:58:52-03:00
X²-5x-14=0
a=1
b=-5
c=-14
---------------------------------
-b+-√b²-4.a.c /2.a
-(-5)+-√-5²-4.1.-14 /2.1
5+-√81 /2
5+-9/2
x1=7
x2=-2

1 5 1
2014-04-24T23:01:32-03:00
X ² - 5x-14=0
delta= b² - 4 x a x c
delta= (-5)² -4 x 1 (-14)
delta=25+56=81
X¹= 5+9=14/2= 7
x²= 5-9=4/2=2

Espero ter ajudado.