| Exam Board | OCR MEI |
|---|---|
| Module | C1 (Core Mathematics 1) |
| Year | 2015 |
| Session | June |
| Marks | 2 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Solving quadratics and applications |
| Type | Rearranging formula - single step isolation (square/root/fraction) |
| Difficulty | Easy -1.2 This is a straightforward algebraic manipulation requiring division by π(x+y) and taking a square root. It's simpler than average A-level questions as it involves only basic rearrangement with no quadratic formula, factorization, or problem-solving—just mechanical steps with the constraint r>0 eliminating ambiguity about sign. |
| Spec | 1.02a Indices: laws of indices for rational exponents |
1 Make $r$ the subject of the formula $A = \pi r ^ { 2 } ( x + y )$, where $r > 0$.
\hfill \mbox{\textit{OCR MEI C1 2015 Q1 [2]}}