Question

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

Answer 1

A,B,D because the sum of the powers of variables in each term of the expansion is equal to the power the binomial is raised to.

Answer 2

The terms A, B, and D appear in the expansion.

The sum of the powers of the variables in each term should equal the power of the binomial.

A ) In $ax^{3}y^{7}$, the sum of the powers, 3 + 7, equals 10.

B ) In $ax^{4}y^{6}$, the sum of the powers, 4 + 6, equals 10.

D ) In $ax^{6}y^{4}$, the sum of the powers, 6 + 4, equal 10.

C ) In $ax^{5}$, the power, 5, does not equal 10, so it does not appear in the expansion.