Leon evaluated the expression Negative one-half(–4a – 6) + a2 for a = 8.

Negative one-half(-4(8) - 6) + 82
Negative one-half (-32-6) + 82
Negative one-half(-38) + 82
Negative one-half(-38) + 16
–19 + 16
–3
Analyze Leon's work. Check all that apply.