Question

"The Binomial Theorem Formalized"
Use the binomial theorem to expand expressions 1-4 and answer question 5.
1. (3x² + y)²
2. (5x4+2y5)4
3. (x³ + 4y2)5
4. (x-2y)6
5. Find the coefficient of x3y4 in the expansion of (2x + 5y²)5.