Product of n square - n+1square

Calculating the product of n square - n+1 square

n square - n+1 square =  -n - n+1

 Example: If  n square =13 , n+1 square = 13 +1 square

so, n+1 square = 14 

n square=13

n+1 square=14

Calculation in normal process

13 square-14 square

13 square=169

14 square=196

13 square-14 square=169-196= -27

Calculation using formula

13 square -14 square = -13 - 14 = -27   [as n square - n+1 square = 

                                                                     -n - n+1]