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Home > PC > Chapter 8 > Lesson 8.2.2 > Problem 8-95

8-95.

Expand and simplify: (a + b)4 − (a − b)4. Homework Help ✎

Expand the first part twice with a negative sign between and substitute (−b) for b in the second part. Carefully distribute to simplify.

(a4 + 4a3b + 6a2b2 + 4ab3 + b4) − (a4 + 4a3(−b) + 6a2(−b)2 + 4a(−b)3 + (−b)4)