Algebra-2

Question Analysis
This problem assesses the understanding of binomial coefficients and their application in expanding binomials using Pascal's Triangle.

Key Concept Explanation
The binomial theorem states that . The coefficients in the expansion are found in Pascal's Triangle.

Step-by-step Solution
1. Identify the 9th row of Pascal's Triangle: 1, 9, 36, 84, 126, 126, 84, 36, 9, 1
2. Identify the expansion of :