Question

Notice that the curve given by the parametric equations xy==64−????2????3−9???? is symmetric about the x-axis. (If ???? gives us the point (x,y), then −???? will give (x,−y) ). At which x value is the tangent to this curve horizontal?

Answer 1

which x value is the tangent to this curve horizontal = 58.67

Explanation:

The detailed step and appropriate differentiation is as shown in the attachment.