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​Q9: Question – Paper 6 – June 2018

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Question

9) The graph of y = x³ - 7x - 12 is shown below.

The root of the equation x3 - 7x - 12 = 0 is p.

a) Calculate y when x = 3.

[1 mark]

b) Show that 3 < p​ < 4.

[2 marks]

c) Find a smaller interval that contains the value of p.
You must show calculations to support your answer. 

​............... < p < ...............

[3 marks]

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