Find the equation of the tangent line at
Use the point-slope formula.
to find the slope at . You already know the point.
Find the equation of the line normal to the tangent at
Normal lines are means perpendicular to the tangent line at the point of tangency.
Find all points on
with the same slope as in part (b).
the slope in part (b). Solve for . Then find the corresponding -value(s). Write your answer(s) as coordinate point(s).