Let's expand using Pascal's Triangle.
Step 1: List Each Term
According to the binomial theorem:
.
For , we can list each term:
1. corresponds to .
2. corresponds to .
3. corresponds to .
Step 2: Use Pascal's Triangle to Determine Coefficients
Pascal's Triangle is constructed as follows:
Row 0: (1)
Row 1: (1, 1)
Row 2: (1, 2, 1).
For