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**Question**

18 a)

i) Write *x*^{2} + 4*x* – 16 in the form (*x* + a)^{2} – b

**[3 marks]**

ii) Solve the equation* **x*^{2} + 4*x* – 16 = 0

Give your answers in surd form as simply as possible.

*x*= ................... or

*x*= .....................

**[4 marks]**

b) Sketch the graph of *y* =* x*^{2} + 4*x* – 16, showing clearly the coordinates of any turning points.

**[3 marks]**