(4y-5)³...?..........
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Solution :
→ ( 4y - 5 )³
→ ( 4y )³ - 5³ - 3 × ( 4y )² × 5 + 3 × 4y × 5²
→ 64y³ - 125 - 240y² + 100y
→ 64y³ - 249y² + 100y - 125
Identity Used :
→ ( a - b )³ = a³ - b³ - 3a²b + 3ab²
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