Respostas

2013-07-25T15:57:04-03:00
X²+x=12
x²+x-12=0
a=1; b=1; c=-12

Delta= b²-4ac
D= 1²-4.1.(-12)
D=1+48
D=49

x= -b+/-VDelta/2.a
x= -1+/-7 / 2.1
x= -1+/- 7 / 2

x'=-1+7/2
x'=6/2
x'=3

x"=-1-7/2
x"=-8/2
x"=-4