Junior high school mathematics on the image of quadratic function urgent! A rectangular grassland is 10 meters long and 8 meters wide. Now build two intersecting (Note: not vertical) paths x meters wide. At this time, the lawn area is y square meters. Find the functional relationship between X and Y. (two ends of one path are in width, and two ends of the other path are in length) Please write down the calculation process! Thank you

Junior high school mathematics on the image of quadratic function urgent! A rectangular grassland is 10 meters long and 8 meters wide. Now build two intersecting (Note: not vertical) paths x meters wide. At this time, the lawn area is y square meters. Find the functional relationship between X and Y. (two ends of one path are in width, and two ends of the other path are in length) Please write down the calculation process! Thank you

The total area of the grassland is 10 * 8, and the paths are paralleled, which are not perpendicular to each other. Anyway, the area is the same. The area of the path is bottom * high, that is, X * 8 and X * 10, because there is a common part in the middle, and the common part area is x * X
So: y = 10 * 8 - (8 * x + 10 * x-x * x)
y=x^2-18x+80