CAPE Pure Mathematics Unit 1 · May/June 2012 · Paper 1 · Question Q37

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

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