June 2016 Paper 1 Q13
13 Solve \(\qquad \sqrt{125} + \sqrt{20} = \sqrt{80} + \sqrt{x}\) [3 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(\sqrt{125} = 5\sqrt{5}\), \(\sqrt{20} = 2\sqrt{5}\) and \(\sqrt{80} = 4\sqrt{5}\) | M1 | allow one error any two of these correct seen anywhere in the working |
| (\(\sqrt{x}\) =) \(3\sqrt{5}\) | A1 | |
| 45 | A1 |