CAPE Pure Mathematics Unit 1 · May/June 2009 · Paper 1 · Question Q38

If y = \sqrt{2x + 1} then \frac{d^2y}{dx^2} is

1. (A)\frac{1}{(2x + 1)\sqrt{2x + 1}}
2. (B)\frac{-1}{(2x + 1)\sqrt{2x + 1}}
3. (C)\frac{1}{\sqrt{2x + 1}}
4. (D)\frac{1}{(2x + 1)}