Resolva as equações abaixo.
a) 9x²+8x-1=0
b) x²-2x+10=0
c) 9x²-4=0
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a) 9x²+8x-1=0
Δ=8²-4.9.(-1)
Δ=64+36
Δ=100
x= -8+-√100/2.9
x= -8+-10/18
x¹= -8-10/18 = -18/18 = -1
x²= -8+10/18 = 2/18 = 1/9
b) x²-2x+10=0
Δ=(-2)²-4.1.10
Δ= 4-40
Δ= -36
c) 9x²-4=0
Δ= -4.9.(-4)
Δ= 144
x= +-√144/2.9
x= +-12/18
x= +-6/9
x= +-2/3
Δ=8²-4.9.(-1)
Δ=64+36
Δ=100
x= -8+-√100/2.9
x= -8+-10/18
x¹= -8-10/18 = -18/18 = -1
x²= -8+10/18 = 2/18 = 1/9
b) x²-2x+10=0
Δ=(-2)²-4.1.10
Δ= 4-40
Δ= -36
c) 9x²-4=0
Δ= -4.9.(-4)
Δ= 144
x= +-√144/2.9
x= +-12/18
x= +-6/9
x= +-2/3
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