Answer:
Step-by-step explanation:
(a + b)² = a² +2ab + b²
16n⁶ + 40n³ +25 = 4²*(n³)² + 2* 4n³ * 5 + 5²
=(4n³)² + 2 *4n³*5 + 5²
= (4n³ + 5)²
