Problem
$\left.\Delta=5^{2} \cdot(-4) \cdot\right] \cdot(-6)$
Solution
Step 1 ：\(\Delta = 5^2 \cdot (-4) \cdot (-6)\)
Step 2 ：\(\Delta = 25 \cdot (-4) \cdot (-6)\)
Step 3 ：\(\Delta = -100 \cdot (-6)\)
Step 4 ：\(\Delta = 600\)
Step 5 ：\(\boxed{600}\)
