If the side length of a square is increased by 2 cm, its area will be increased by 24 square cm. How many cm is the original side length of the square? Xinye spectator you answer: (24-2 × 2) △ 2 △ 2 = 5 (CM) Excuse me: why subtract 2x2 from 24? The difference is divided by 2 divided by 2?

&As shown in the figure, suppose that the original square has a side length of X, and the side length is increased by 2cm, and the four corners are four small squares with a side length of 1; & nbsp; & nbsp; & nbsp; on the side are four small rectangles with a length of X and a width of 1; & nbsp; & nbsp; & nbsp; the total area increased is 24, then the total surface of the four rectangles

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