Question

What would be the square of 625 using the identity (a +b)2 = a2 + b2 + 2ab?

Answer 1

Answer:

390625

Step-by-step explanation:

Seperate 625 in, 600 and 25, then go on with the method;

=> (600+25)^2 = 600^2 + 25^2 + 2×25×600

= 360000 + 625 + 30000

= 390625