What is the discriminant of 9x2 + 2 = 10x?

Write the equation in standard form: 9x² − 10x + 2 = 0. Here a = 9, b = −10, and c = 2, so the discriminant is b² − 4ac = (−10)² − 4(9)(2) = 100 − 72 = 28. The correct choice is C, 28.

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