sum of consecutive odd numbers starting with 1

Question

express the following as a sum of consecutive odd numbers starting with 1- -

7^2 

81

5^2 

11^2

Answer 1

Sum of odd integers: S_n = n²

49 = n²

7 = n

49 = 1 + 3 + 5 + 7 + 9 + 11 + 13

 

Can you follow the pattern and do the other three?