| Exam Board | WJEC |
|---|---|
| Module | Unit 1 (Unit 1) |
| Year | 2024 |
| Session | June |
| Marks | 4 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Chain Rule |
| Type | Find gradient at specific point |
| Difficulty | Moderate -0.8 This is a straightforward differentiation question requiring only basic power rule application after rewriting terms in index form (x^{1/2} and x^{-1}), then substituting x=9. It's simpler than average A-level questions as it involves no problem-solving, just routine technique with a single substitution step. |
| Spec | 1.07i Differentiate x^n: for rational n and sums |
Given that $y = 12\sqrt{x} - \frac{27}{x} + 4$, find the value of $\frac{dy}{dx}$ when $x = 9$. [4]
\hfill \mbox{\textit{WJEC Unit 1 2024 Q1 [4]}}