Determine the point(s) at which the tangent to the curve is parallel to the -axis.
First, find the slope function by differentiating.
When the tangent is parallel to the -axis, its slope will be 0. Therefore, set this slope function equal to 0 and solve for .
Now find the -coordinates for each of these -values by substituting into the equation of the curve.
Therefore, the coordinates of the two points where the tangent is parallel to the -axis are and .