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

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

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