Cut a rectangle 2cm wide from the square iron sheet, and the remaining area is 35cm2, then the original area of the iron sheet is 35cm2

Cut a rectangle 2cm wide from the square iron sheet, and the remaining area is 35cm2, then the original area of the iron sheet is 35cm2

Let X be on the edge
Then x ^ 2-2x = 35, x = 7
The original area of iron sheet = x ^ 2 = 49