Tentukan determinan matrik berikut ini!​

= (7 × 1 × 1) + (1 × 5 × 1) + (5 × 1 × 5) – (1 × 1 × 5) – (5 × 5 × 7) – (1 × 1 × 1)

= 7 + 5 + 25 – 5 – 175 – 1

= -144