1) Resolva as seguintes equações do 2° grau, identifique os coeficientes e determine as raízes se existir
a) x²-5x+6= 0
b) x²-8x+12= 0
c) x²+2x-8=0
a) x²-5x+6= 0
b) x²-8x+12= 0
c) x²+2x-8=0
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b x²-8x+12=0
a=1
b=-8
c=12
delta=64-48=16
x=(8+-4)/2
x=4/2=2
x=12/2=6
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k 3x²-7x+2=0
a=3
b=-7
c=2
delta=49-24=25
x=(7+-5)/6
x=2/6=1/3
x=12/6=2