The function is and point is
(Apply derivative)
(The sum rule)
(The power rule:
)
(Simplify)
(The rule of exponentiation:
and
)
(Simplify)
To find the slope graph when , evaluate the derivative,
, at
.
(Slope of graph at
)
(Simplify)
Now, using the point slope form of the equation of a line, you can write
\ (Point - slope form)
(Substitute
)
(Simplify)
(Multiplt by 4)
(Subtract 2 from each side)
Therefore the tangent line equation is .
The graph of the function and its tangent line at the point.
\