(-3a+4b)⁴ = (4b-3a)⁴ = (4b-3a)²(4b-3a)² = (16b²-24ab+9a²)(16b²-24ab+9a²) = 256b⁴ - 384ab³ + 144a²b² - 384ab³ + 576a²b² - 216a³b + 144a²b² - 216a³b + 81a⁴ = 256b⁴ - 768ab³ + 864a²b² - 432a³b + 81a⁴
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(-3a+4b)⁴ = (4b-3a)⁴ = (4b-3a)²(4b-3a)² = (16b²-24ab+9a²)(16b²-24ab+9a²) = 256b⁴ - 384ab³ + 144a²b² - 384ab³ + 576a²b² - 216a³b + 144a²b² - 216a³b + 81a⁴ = 256b⁴ - 768ab³ + 864a²b² - 432a³b + 81a⁴