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(x-2y)⁴ = 1. (x)⁴. (-2y)⁰ + 4. (x)³. (-2y)¹ + 6. (x)². (-2y)² + 4. (x)¹ (-2y)³ +1. (x)⁰ (-2y)⁴
= 1. x⁴. 1. +4. x³. -2y+6. x².4y²+4. x. -8y³+1.1.16y⁴
= x⁴-8x³+24x²y²-32xy³+16y⁴
Maaf ya kalau salah ^^