For which values of c does f(x) = x² + cx +9 have a double root? (Give your answer in the form of a comma-separated list. Express numbers in exact form. Use symbolic notation and fractions where needed.) C = For which values of c does f have no real roots? (Write your answer as an inequality. If the intervals are disjoint, separate each inequality with a comma. Express numbers in exact form. Use symbolic notation and fractions where needed.) f has no real roots for c such that:

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