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Are these answers incorrect?

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Your answers seem correct to me. The odd phrasing of the last question - "has only two zeroes" - makes me wonder if the question was mistyped and should have said one zero. Why would a quadratic have "only" two zeroes?
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They are correct.
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Is it possible teacher misread your first answer as (7, 11 ?

Have you studied complex roots, or just real roots, of quadratics?

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