Question

evaluate 205 square using identity

Answer 1

Answer:

1. 205................

Answer 2

Answer:

Hope this will help you :

Step-by-step explanation:

Here, we will use the identity (a+b)^2 = a^2  +  2ab  +   b^2  .  so we  can write 205 as (200 + 5)  then we square it so we get (200+5)^2, then we use the identity  = 200*200   + 2*200*5  +  5*5  = 40000+2000+25 =  42025.                                  

                         ANSWER : 42025