| Exam Board | Edexcel |
|---|---|
| Module | C1 (Core Mathematics 1) |
| Marks | 2 |
| Paper | Download PDF ↗ |
| Topic | Indices and Surds |
| Type | Expand and simplify surd expressions |
| Difficulty | Easy -1.8 This is a direct application of the difference of two squares formula (a+b)(a-b)=a²-b², requiring only one step to reach 9-5=4. It's a routine algebraic manipulation with no problem-solving element, making it easier than the typical A-level question and comparable to basic index law recall. |
| Spec | 1.02b Surds: manipulation and rationalising denominators |
Simplify $(3 + \sqrt{5})(3 - \sqrt{5})$. [2]
\hfill \mbox{\textit{Edexcel C1 Q1 [2]}}