A 20 meter fence is used to form a rectangular flower garden. The side of the wall is x, and the area of the rectangle is y 1) Write the function analytic expression of Y with respect to X; 2) What is the area of the rectangle when x = 3? To be right, it must be right

A 20 meter fence is used to form a rectangular flower garden. The side of the wall is x, and the area of the rectangle is y 1) Write the function analytic expression of Y with respect to X; 2) What is the area of the rectangle when x = 3? To be right, it must be right


y=x×(20-2x)
When x = 3
Y = 3 × (20-6) = 42 square meters

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