Solving it: (a + b)³
1. Cube the first term. = a³.
2. Square the first term, then combine it with 3 and the last term. = 3a²b
3. Same procedure, but this time, square the last term instead of first term. = 3ab²
4. Cube the last term. = b³
FINAL = a³ + 3a²b + 3ab² + b³