Resolva as seguintes equaçoes do 2 grau , identifique os coeficientes e determine as raizes se existir . - x^{2} + x+12=0
- x^{2} +6x-5=0
3 x^{2} -7x+2=0
 x^{2} -18x+45=0
- x^{2} -x+30=0
 x^{2} -6x+9=0
geeente por favor me ajudem !!!! 
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