Ajudem pf glr URGENTE
Resolva as equaçoes de 2 grau usando as formulas gerais:

a) -x(elevado a 2) + x + 12=0

b) 7x(elevado 2) + x + 1= 0

c) x(elevado 2) - x - 1 = 0

d) 6x(elevado 2) +x-1=0

e) 2x(elevado 2) -4x + 3=0

f) x(elevado 2 ) 4x - 21 = 0
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