| Exam Board | OCR MEI |
|---|---|
| Module | C3 (Core Mathematics 3) |
| Marks | 2 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Modulus function |
| Type | Express interval using modulus notation |
| Difficulty | Easy -1.2 This is a straightforward application of the modulus function definition requiring students to recognize that the midpoint of the interval gives 'a' and half the width gives 'b'. It's a routine textbook exercise with minimal problem-solving—just pattern recognition and simple arithmetic (a=2, b=1). |
| Spec | 1.02l Modulus function: notation, relations, equations and inequalities |
| Answer | Marks |
|---|---|
| \(x^2 1\) | B1 B1 |
| [2] | oe |
Question 2:
$1 < x < 3$ $1 < x$ $2 < 1$
$x^2 1$ | B1 B1
[2] | oe
[or $a = 2$ and $b = 1$]2 Express $1 < x < 3$ im th $\quad | x - a | < b$, where $a$ and $b$ are to be determined.
\hfill \mbox{\textit{OCR MEI C3 Q2 [2]}}