Question

find the spuare of the following numbers whith out dctual multiplication
39​

Answer 1

Answer:

1521

Step-by-step explanation:

consider the given number 39

we know that,

(a-b)2=a2+b2-2ab

Therefore,

(40-1)2=(40)2+(1)2-2×40×1

(39)2=1600+1-80

(39)2=1521

HENCE THIS IS ANSWER!! :)