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**Mark Scheme**

**Working**

Show that

can be written in the form

where

*a*,*b*,*c*and*d*are integers.b) Solve

**Question**

18) Show that

can be written in the form

where

*a*,*b*,*c*and*d*are integers.**[3 marks]**

b) Solve

**[3 marks]**