(2.5)² × 2.5 − 3 × 0.5 × (2.5)² + 3 × 2.5 × (0.5)² − (0.5)³ = ?
Show answer & explanation
Correct answer: A
Explanation
(2.5)² × 2.5 − 3 × 0.5 × (2.5)² + 3 × 2.5 × (0.5)² − (0.5)³
(a - b)³ = a³ − 3a²b + 3ab² − b³
a = 2.5
b = 0.5
(2.5 − 0.5)³
= (2)³ = 8