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Calculate the coefficient of x^5 in the expansion of (x - 3)^7. (2021)

Practice Questions

1 question
Q1
Calculate the coefficient of x^5 in the expansion of (x - 3)^7. (2021)
  1. -189
  2. -243
  3. -126
  4. -21

Questions & Step-by-step Solutions

1 item
Q
Q: Calculate the coefficient of x^5 in the expansion of (x - 3)^7. (2021)
Solution: The coefficient of x^5 is C(7,5) * (-3)^2 = 21 * 9 = -189.
Steps: 0

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