If the side length of a square is increased by one centimeter, the area will be increased by seventeen square centimeters. What is the area of the original square?

If the side length of a square is increased by one centimeter, the area will be increased by seventeen square centimeters. What is the area of the original square?

What is added is actually a small square with side length of 1, and two rectangles with side length of 1 and side length of original side. You can understand it by drawing the figure below,
What is the area of the two rectangles
17-1=16
So the area of a rectangle is
16÷2=8
So the original side length is
8÷1=8
So the area of the original square is
8 × 8 = 64 square centimeter
If you are satisfied with my answer,
Friends who ask questions from mobile phones can click "satisfied" in the upper right corner of the client!