If each side of a square is decreased by four inches the resulting square has an area of 25 sq. In. Find the dimensions and are of the original square

Question

I really don't get this problem can someone please help me 

Answer 1

let original side length of larger square be x units.

Now we're told that (x-4)² = 25.  Can you solve for x?

Don't forget to check your answers (one must be rejected) for x, and don't forget to give two answers:

x, original side length, and x squared, area (sq in).