Can someone help me to answer this question, please and explain it.

This is calculus 1

[ Select ] a local max a local min no local extrema[ Select ]f (ac) = 24 - 8x2 + 1 has critical numbers 0, -2, and +2 f " ( 2 ) [ Select ] O so f has [ Select ] at x = 2 f " ( - 2 ) [ Select ] O so f has [ Select ] V at x = -2 f" (0 ) [ Select ] | 0 so f has [ Select ] at x = 0