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)