A curve has equation \(y = x ^ { 3 } - x ^ { 2 }\).
Find the gradient of the line passing through the point \(( 5,100 )\) and the point on the curve for which \(x = 5 + h\). Give your answer in the form
$$p + q h + r h ^ { 2 }$$
where \(p , q\) and \(r\) are integers.
Show how the answer to part (b)(i) can be used to find the gradient of the curve at the point \(( 5,100 )\). State the value of this gradient.