Resolva as equações do 2º grau. a) x(x - 3) - 2 (x - 3) = 6
b) (x + 5)² = 25
c) (x - 2)² = 4 - 9x
d) (x + 1) (x - 3) = -3
b) (x + 5)² = 25
c) (x - 2)² = 4 - 9x
d) (x + 1) (x - 3) = -3
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