Question

What is the sign of the third term of the expansion of (x - y)n for n = 3, 4, and 5?

a.
positive

b.
negative

Answer 1

A;)

Step-by-step explanation:i dont have negative sign

Answer 2

a.

positive

Step-by-step explanation

The given binomial expansion is:

`{(x - y)}^(n)`

We can see that the second term is negative (-y).

When we expand this binomial for n=3,4, and 5, the sign is got to alternate.

The first term is positive

The second term negative

The third term is positive

The first choice is correct.