Find the squire of adjacent number

Hello friends we came back with the new trick of math’s
Toda we will find the squire of adjacent number
You know the square of 30,40,50,60,etc..But if you are required a square of a no 61,71,26,  etc then you will do the long paper work to find the answer.
Think can it be done immediately?
Yes today I will tells you a simple method to do this
For example we have to find the square of 61
Say you know the square of 60

Say yes square of 60= 3600
Now the formula is square of 61 = square of 60+(60+61)
That is                     3600+(121)=3721
Let’s take an another example
We want the square of 26
Say you know the square of 25
Now the formula is
Square of 25 +(25+26)  = 625+51
                                      = 676
Please share it with your friends and keep visiting for the new tricks.
Thank you