What is the discriminant of the quadratic equation 2x + 5x2 = 1?

Write the equation in standard form: 5x² + 2x − 1 = 0. Here a = 5, b = 2, and c = −1, so the discriminant is b² − 4ac = 2² − 4(5)(−1) = 4 + 20 = 24. The correct choice is 24.

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