(a)

The function is  and point is .

Apply derivative on each side with respect to .

Constant multiple rule and power rule : .

.

Find the slope of the tangent line at .

Substitute  in .

Therefore, slope of the tangent line .

\

\

Point-slope form of line equation is .

\

Substitute  and  in the point-slope form.

\

\

The tangent line equation is .

(b)

Graph the function  and the tangent line .

(c)

Graph of the function using derivative feature of a graphing utility.

The tangent line equation is .