Question

Which of the following terms appear in the expansion of (x + y)10? The letter a in each term represents a real constant.

A. ax3y7
B. ax6y4
C. ax5
D. ax4y6

Answer 1

ax^3y^7

ax^4y^5

ax^5y^4

Explanation:

A P E X

Answer 2

the answer is D. ax4y6
proof

the binome of newton is S a x^k y^n-k = (x+y)^n, for k=0...n
for n=10, it is a y^10+...+ a x4 y^10-4 +...+ax^10