Intermediate November 2021 Unit 1 Q5
5. A number \(n\) is added to the square root of 81.
The answer is equal to 7 squared.
What is the value of \(n\)? [3]
\(n\) = …………………
| Scheme | Marks | Comments |
|---|---|---|
| Sight of 9 AND 49 | B1 | |
| n + 9 = 49 | M1 | Any unambiguous indication that this linear relationship is being considered (including ‘trial and improvement’). FT their √81 (≠81) AND their 72 (≠7) for M1 and possibly A1 if at least one correct value used. FT for M1 only if neither correct value used. Award M1 if 49 – 9 seen. |
| (n =) 40 | A1 | Mark final answer. |