resolva as equacoes de 2 grau em r
a)x²-7x+6=0
b)x²+3x-18=o
c)3x²-5x+3=0
d)2x²-6x-20=o
e)7x²-21x=0
f)2x²+x+16=0
g)x²-12x+36=0
h)x²-16x+64=0
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a)x²-7x+6=0
Δ = 49-24 = 25
x1= 6 ; x2 = 1
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b)x²+3x-18=o
Δ = 9+72 = 81
x1= 6 ; x2 = - 3
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c)3x²-5x+3=0
Δ = 25-36 = - 11 ∅
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d)2x² - 6x-20=o
Δ = 36+160 = 196
x1= 5 ; x2 = - 2
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e)7x²-21x=0
Δ = 441-0 = 441 ==> 21
x1= 3 ; x2 = 0
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f)2x²+x+16=0
Δ = 1-128 = - 127 ∅
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g)x²-12x+36=0
Δ = 144-144 = 0
x1= x2 = 6
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h)x²-16x+64=0
Δ = 256-256 = 0
x1= 8 ; x2 = 8
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