Respostas

2014-04-01T23:57:53-03:00
X²-2x=5x+8
x²-2x-5x-8=0
x²-7x-8=0


2014-04-01T23:57:58-03:00
X²-2 x =5x +8
x²-2x -5x-8=0
x²-7x-8=0
a=1,b=-7,c=-8
Δ= b²-4 . a .c
Δ= 49-4. 1 .--8
Δ=49+32
Δ=81

x1=(-b+√Δ): 2.a
x1=(7+9): 2.1=
x1=16:4
x1=4

x2=(-b-√Δ): 2.a
x2=(7 -9): 2.1=
x2=-2:2
x2=-1

s=(-1 e 4)
1 5 1