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Equations with equal roots (intermediate)

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The quadratic equation k, x, squared, minus, 4, x, plus, 36, k, equals, 0 has two equal roots and k, is greater than, 0.
Find the value of k.
k, equals
  • Your answer should be
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4