The discriminant is b2 – 4ac = (–8)2 – (4)(2)(–10) = .

Substitute the values into the discriminant: (−8)² − (4)(2)(−10). Since (−8)² = 64 and (4)(2)(−10) = −80, the calculation is 64 − (−80) = 144. The correct choice is 144.

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