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b. 1(a)⁴ + 4(a)³(-5) + 6(a)²(-5)² + 4(a)(-5)³ + 1(-5)⁴ = a⁴ - 20a³ + 150a² - 500a³ + 625
c. 1(2x)³ + 3(2x)²(y) + 3(2x)(y)² + 1(y)³ = 8x³ + 12x²y + 6xy² +y³
d. 1(3m)⁴ + 4(3m)³(-2n) + 6(3m)²(-2n)² + 4(3m)(-2n)³ + 1(-2n)⁴ = 81m⁴ - 216m³n - 216m²n² + 96mn³ + 16n⁴
e. 1(3a)⁵ +5(3a)⁴(-2) + 10(3a)³(-2)² + 10(3a)²(-2)³ + 5(3a)(-2)⁴ + 1(-2)⁵ = 243a⁵ - 810a⁴ + 1080a³ - 720a² + 240a - 32
Maaf kalau ada yang salah