| Exam Board | Edexcel |
|---|---|
| Module | C1 (Core Mathematics 1) |
| Year | 2012 |
| Session | June |
| Marks | 5 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Indices and Surds |
| Type | Show surd expression equals value |
| Difficulty | Moderate -0.8 This is a standard C1 rationalising the denominator question requiring simplification of surds and multiplication by the conjugate. It's routine bookwork with clear steps (simplify √12 and √8, multiply by conjugate, simplify), making it easier than average but not trivial since students must execute multiple algebraic steps correctly. |
| Spec | 1.02b Surds: manipulation and rationalising denominators |
3. Show that $\frac { 2 } { \sqrt { } ( 12 ) - \sqrt { } ( 8 ) }$ can be written in the form $\sqrt { } a + \sqrt { } b$, where $a$ and $b$ are integers.\\
\hfill \mbox{\textit{Edexcel C1 2012 Q3 [5]}}