Home / $ k = 1 $: $ (-1)^1 \binom{5}{1} \cdot 4^8 = -1 \cdot 5 \cdot 65536 = -327680 $$ k = 1 $: $ (-1)^1 \binom{5}{1} \cdot 4^8 = -1 \cdot 5 \cdot 65536 = -327680 $February 22, 2026