In each of the following expansions , find the term as stated .
(1) , 5th term
(2) , 10th term
(3) , constant term
Use the formula:
Keep in mind that you start counting by zero! Thus the 5th term correspond with k = 4.
Therefore the 5th term of
For the last example: A constant term only occurs if the exponents of x and are equal, thus you have to calculate the 4th term with k = 3. Since k is an odd number you get as the constant summand -20.