Note: This is a scheme programming language task,
Please don't give answer if you don't know about anything. Please write what is asked.
Question: Write a wrapper function, named bexpand, that takes three arguments: two variable names (such as x and y), and a number n. N represents the highest exponent in the expanded list, as well as the row number from pascal's triangle. The row containing ‘(1) in pascal's triangle is the zeroth row.