Help Me

Note something:

1 = 1

1 + 3 = 4

1 + 3 + 5 = 9

1 + 3 + 4 + 9 = 16

So.....the sum of the first N odd numbers = N^2

So   57^2 = 3249

help him pls

to elaborate on CPhil's answer.  Consider the sum of the first N odd numbers

\(s=\displaystyle{\sum_{k=1}^N}(2k-1) \\ s = 2 \displaystyle{\sum_{k=1}^N}k -\displaystyle{\sum_{k=1}^N}1\\ s=2\dfrac{N(N+1)}{2}-N\\ s=N^2+N-N=N^2\)

Thanks, Rom   !!!