Which of the following is a quadratic equation? * - k^2 + 5k + 7 =0
(x+ 4)^2 = (x - 1)(x + 3)
x^2 +9x - 2
x^3 - 7x +2 =0
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Which of the following is a quadratic equation? * - k^2 + 5k + 7 =0
(x+ 4)^2 = (x - 1)(x + 3)
x^2 +9x - 2
x^3 - 7x +2 =0
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