Foundation June 2018 Paper 1 Q20
20 Work out \(\quad \sqrt{121} - (13 - 5 \times 2)^2\) [3 marks]
| Answer | Mark | Comments |
|---|---|---|
| \((\sqrt{121} =)\) 11 or \(-11\) or \(121 = 11^2\) or \(121 = 11 \times 11\) seen | B1 | oe |
| \(13 - 10\) or 3 or \((13 - 10)^2\) or \(3^2\) or \(3 \times 3\) or 9 | M1 | |
| 2 or \(-20\) | A1ft | ft their 11 |
Additional guidance
| Accept 2 and \(-20\) | B1M1A1ft |
| \(11 - 16^2\) or \(11 - 256\) or \(-245\) | B1M0A0 |
| \(11 \times 9 = 99\) | B1M1A0 |
| \(\sqrt{121} = 60.5\), \(60.5 - 3^2 = 51.5\) | B0M1A1ft |
| \(60.5 - 3^2 = 51.5\) | B0M1A0ft |