A rectangular schoolyard is to be fenced in using the wall of the school for one side and 150 meters of fencing for the other three sides. The area in square meters of the schoolyard is a function of the length in meters of each of the sides perpendicular to the school wall. Write an expression for . What is the area of the schoolyard when ? What is a reasonable domain for in this context?

Q: d (x+;

A: Here we use chain rule of differenciation.

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