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Nov 2016 p12 q7
1113
The equation of a curve is \(y = 2 + \frac{3}{2x - 1}\).
(i) Obtain an expression for \(\frac{dy}{dx}\).
(ii) Explain why the curve has no stationary points.
At the point \(P\) on the curve, \(x = 2\).
(iii) Show that the normal to the curve at \(P\) passes through the origin.
(iv) A point moves along the curve in such a way that its \(x\)-coordinate is decreasing at a constant rate of 0.06 units per second. Find the rate of change of the \(y\)-coordinate as the point passes through \(P\).
Solution
(i) Differentiate \(y = 2 + \frac{3}{2x - 1}\) using the chain rule:
Let \(u = 2x - 1\), then \(\frac{du}{dx} = 2\).
\(y = 2 + \frac{3}{u}\), so \(\frac{dy}{du} = -\frac{3}{u^2}\).