Sejam α e β as raízes da equação px² + qx + r = 0. Se q é a média aritmética de p e r e 1/α  + 1/β = 4, então o valor de |α - β| é (a) 2√17 : 9
(b) √34 : 9
(c) √61 : 9
(d) 2√13 : 9
(e) 1 : 9
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