
### Instruction: help me answer this question Expand (1 - 3x)⁷ using the binomial theorem., think step by step
### Assistant: The given text provides a detailed explanation for this calculation. , The answer is The expanded expression of (1 - 3x)⁷ is 1 - 21x + 210x² - 1260x³ + 4725x⁴ - 11340x⁵ + 17010x⁶ - 15120x⁷ + 6237x⁸.
