The diagram shows the curve $y = \left( {x - 4} \right){e^{\frac{1}{2}x}}$. The curve has a gradient of 3 at the point $P$.
a) Show that the x-coordinate of $P$ satisfies the equation
$x = 2 + 6{e^{ - \frac{1}{2}x}}$.
b) Verify that the equation in part (a) has a root between $x = 3.1$ and $x = 3.3$.
c) Use the iterative formula ${x_{n + 1}} = 2 + 6{e^{ - \frac{1}{2}{x_n}}}$ to determine this root correct to 2 decimal places. Give the result of each iteration to 4 decimal places.

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