Specimen 2020 Paper 1 Q18
18 Solve \(\quad x^{-\frac{2}{3}} = 12\dfrac{1}{4}\) [3 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(\left(x^{-\frac{2}{3}} =\right)\ \dfrac{49}{4}\) or \(x^{\frac{2}{3}} = \dfrac{4}{49}\) | M1 | |
| \(\left(\dfrac{49}{4}\right)^{\frac{3}{2}}\) or \(\left(\dfrac{4}{49}\right)^{\frac{3}{2}}\) | M1dep | oe |
| \(\dfrac{8}{343}\) | A1 |