12) Resolva, no conjunto R, as equações do 2º grau:
a) x² + x. (2x - 45) = 0
b) x² +100=0
c) (3x + 2)² + (2x - 1)² = 4(2x + 5) + 12x² + 1
D)x2 -81=0
E)x2-7x+6=0
F)6x2+3x=1+2x
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