The function is .

                                 (Apply derivative)

              (Apply product rule)

(Rewrite the expression)

   (Apply General power rule)

                  (Simplify)

To find slope at the point (4, 8)

So,                      (Graph on the point)

To find the tangent line use point-slope form.

                                 (point-slope form)

                                     (Substitute )

                                        (Multipil each side by 3)

                                              (Add 12 to each side)

Therefore the tangent line is .

The tangent line to the graph of the function at given point (4, 8).