Higher June 2018 Paper 1R Q5
5 \(E = n^2 + n + 5\)
Ali thinks that the value of \(E\) will be a prime number for any whole number value of \(n\).
Is Ali correct?
You must give a reason for your answer.
(2)
| Scheme | Marks | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For example,
| M1 | ||||||||||||
| No + reason | A1 | ||||||||||||
| (2) | |||||||||||||
| (2 marks) |
Notes
M1: for evaluating \(E\) correctly for any value of \(n\)
A1: for No with \(E\) evaluated correctly as a non-prime number