A quadratic equation of the form 0 is equal to a x squared plus b x plus c has one real number solution. Which could be the equation?

A quadratic has exactly one real solution when its discriminant, b² − 4ac, equals 0. For choice D, a = −2, b = −4, and c = −2, so the discriminant is (−4)² − 4(−2)(−2) = 16 − 16 = 0. Therefore, the equation in choice D has one real solution.

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