A rectangle has two of its vertices as the $x$-axis. The other two vertices are on the parabola whose equation is $y=18-x^2$.
What are the dimensions of the rectangle if its area is to be a maximum?
A rectangle has two of its vertices as the $x$-axis. The other two vertices are on the parabola whose equation is $y=18-x^2$.
What are the dimensions of the rectangle if its area is to be a maximum?