2 A curve has equation
$$y = x ^ { 2 } - 6 x + 5$$
The points \(A\) and \(B\) on the curve have \(x\)-coordinates 2 and \(2 + h\) respectively.
- Find, in terms of \(h\), the gradient of the line \(A B\), giving your answer in its simplest form.
- Explain how the result of part (a) can be used to find the gradient of the curve at \(A\). State the value of this gradient.