To find the equation of the line tangent to at , we need:

• The slope of the secant line, , given by .
• The ordered pair .

The Plan

1. To find , we will first find using the formula, . Then, we evaluate at .
2. To find the ordered pair, we plug into our equation, .



From the graph above, we see . This is shown algebraically in the Solution pdf at the end of the page. Using point slope form, our equation is given by, . In this case, and . .