Question

Find the square of 405 with the help of identity.... ​

Answer 1

Step-by-step explanation:

405= 400+5

here a=400 and b=5

(a+b)²= a²+b²+2ab

(400+5)²= 400²+5²+2(400)(5)

(405)²= 160000+25+800(5)

(405)²= 160000+25+4000

(405)²= 164025

Mark it as brainlist...........