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Home > A2C > Chapter 13 > Lesson 13.1.4 > Problem 13-88

13-88.
  1. What is the fifth term of each expansion? Homework Help ✎

    1. (a + b)9

    2. (2x + y)8

Use the binomial theorem.

9C5 · a5 · b9−5 = 126a5b4

See part (a).