Question 1
The roots of the equation 20x3 – 16x2 – 4x + 7 = 0 are α, β and γ
Find the value of αβ + βγ + γα
Circle your answer.
[1 mark]
The roots of the equation 20x3 – 16x2 – 4x + 7 = 0 are α, β and γ
Find the value of αβ + βγ + γα
Circle your answer.
[1 mark]
Which one of the following is a real number?
Circle your answer.
z4 z5 z6 z7
[1 mark]
[1 mark]
Which one of the following statements is correct?
Tick (✓) one box.
[1 mark]
Find a vector that is normal to the plane ∏ 5 (a)
[3 marks]
Find a Cartesian equation of the plane ∏ 5 (b)
[2 marks]
The ellipse E has equation
The line with equation y = mx + 4 is a tangent to E
Without using differentiation show that m = ±
[4 marks]
It is given that
Starting from the exponential definition of the sinh function, show that sinh p = r
[4 marks]
Solve the equation cosh2 x = 2sinh x + 16
Give your answers in logarithmic form.
[4 marks]
The complex numbers z and w are defined by
By evaluating the product zw, show that
[6 marks]
[1 mark]
[4 marks]
Show that the angle between L1 and L2 is 0.701 radians, correct to three decimal places.
[4 marks]
Find the shortest distance between L1 and L2
Give your answer in an exact form.
[6 marks]
Use de Moivre’s theorem to show that
cos3θ = 4cos3θ – 3cosθ
[3 marks]
Use de Moivre’s theorem to express sin3θ in terms of sinθ
[2 marks]
Solve the differential equation
given that y = 3 when x = ln2
Give your answer in an exact form.
[7 marks]
A curve is defined parametrically by the equations
Show that the arc length of the curve from t = 0 to t = 2 is equal to 26 units.
[5 marks]
The curve C has polar equation r = 2 + tanθ The curve C meets the line θ = at the point A The point B has polar coordinates (4, 0)
The diagram shows part of the curve C, and the points A and B
Find the area of the shaded region.
Give your answer in an exact form.
[7 marks]
By making a suitable substitution, show that
[7 marks]
Find the extension of each string when the system is in equilibrium.
[3 marks]
The ball is pulled a distance of 0.6 metres downwards from its equilibrium position towards C, and released from rest.
Show that during the subsequent motion the particle satisfies the differential equation
where x metres is the displacement of the particle below the equilibrium position at time t seconds after the particle is released.
[3 marks]
State one limitation of the model used in part (b)
[1 mark]
The paper as printed
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