Foundation November 2021 Paper 2 Q5
5 Work out the value of \(\quad a^2 - 4a \quad\) when \(\quad a = 10\) [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| 60 | B2 | B1 \(10^2 - 4 \times 10\) or \(10^2 - 4(10)\) or 100 or 40 or \(-40\) seen or implied |
Additional guidance
| Embedded correct value eg \(100 - 4a = 96a\) | B1 |
| Further correct work eg \(100 - 40 = 60\), Answer \(6a\) | B2 |
| Further incorrect work eg \(100 - 40 = 60\), Answer \(60a\) | B1 |
| Values may be implied eg1 \(10^2 - 4 = 96\) implies 100 eg2 96 only does not imply 100 | B1 B0 |
| Incorrect calculations cannot imply a value eg \(10^2 - 4a = 96a\) | B0 |
| \(100a\) does not imply 100 | B0 |