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Verified answer
Perpangkatan dengan koefisien Pascal(a+b) = 1 (a³) + 3(a²)(b) + 3(a)(b²) + 1 (b³)
(4x + 5y)³ = 1 (4x)³ + 3(4x)²(5y) + 3(4x)(5y)² + 1 (5y)³
= 1(64x³) + 2(16x²)(5y) + 3 (4x)(25y²) + 1 (125 y³)
= 64 x³ + 160 x²y + 300 xy² + 125 y³