Questions — AQA FP2 (145 questions)

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AQA FP2 2013 January Q4
9 marks Standard +0.3
The roots of the equation $$z^3 - 5z^2 + kz - 4 = 0$$ are \(\alpha\), \(\beta\) and \(\gamma\).
    1. Write down the value of \(\alpha + \beta + \gamma\) and the value of \(\alpha\beta\gamma\). [2 marks]
    2. Hence find the value of \(\alpha^2\beta\gamma + \alpha\beta^2\gamma + \alpha\beta\gamma^2\). [2 marks]
  1. The value of \(\alpha^2\beta^2 + \beta^2\gamma^2 + \gamma^2\alpha^2\) is \(-4\).
    1. Explain why \(\alpha\), \(\beta\) and \(\gamma\) cannot all be real. [1 mark]
    2. By considering \((\alpha\beta + \beta\gamma + \gamma\alpha)^2\), find the possible values of \(k\). [4 marks]
AQA FP2 2013 January Q5
11 marks Standard +0.8
  1. Using the definition \(\tanh y = \frac{\text{e}^y - \text{e}^{-y}}{\text{e}^y + \text{e}^{-y}}\), show that, for \(|x| < 1\), $$\tanh^{-1} x = \frac{1}{2} \ln \left(\frac{1+x}{1-x}\right)$$ [3 marks]
  2. Hence, or otherwise, show that \(\frac{\text{d}}{\text{d}x}(\tanh^{-1} x) = \frac{1}{1-x^2}\). [3 marks]
  3. Use integration by parts to show that $$\int_{0}^{\frac{1}{4}} \tanh^{-1} x \, \text{d}x = \ln \left(\frac{3^m}{2^n}\right)$$ where \(m\) and \(n\) are positive integers. [5 marks]
AQA FP2 2013 January Q6
8 marks Standard +0.8
A curve is defined parametrically by $$x = t^3 + 5, \quad y = 6t^2 - 1$$ The arc length between the points where \(t = 0\) and \(t = 3\) on the curve is \(s\).
  1. Show that \(s = \int_{0}^{3} 3t\sqrt{t^2 + A} \, \text{d}t\), stating the value of the constant \(A\). [4 marks]
  2. Hence show that \(s = 61\). [4 marks]
AQA FP2 2013 January Q7
9 marks Standard +0.8
The polynomial \(\text{p}(n)\) is given by \(\text{p}(n) = (n-1)^3 + n^3 + (n+1)^3\).
    1. Show that \(\text{p}(k+1) - \text{p}(k)\), where \(k\) is a positive integer, is a multiple of 9. [3 marks]
    2. Prove by induction that \(\text{p}(n)\) is a multiple of 9 for all integers \(n \geqslant 1\). [4 marks]
  1. Using the result from part (a)(ii), show that \(n(n^2 + 2)\) is a multiple of 3 for any positive integer \(n\). [2 marks]
AQA FP2 2013 January Q8
14 marks Challenging +1.2
  1. Express \(-4 + 4\sqrt{3}\text{i}\) in the form \(r\text{e}^{\text{i}\theta}\), where \(r > 0\) and \(-\pi < \theta \leqslant \pi\). [3 marks]
    1. Solve the equation \(z^3 = -4 + 4\sqrt{3}\text{i}\), giving your answers in the form \(r\text{e}^{\text{i}\theta}\), where \(r > 0\) and \(-\pi < \theta \leqslant \pi\). [4 marks]
    2. The roots of the equation \(z^3 = -4 + 4\sqrt{3}\text{i}\) are represented by the points \(P\), \(Q\) and \(R\) on an Argand diagram. Find the area of the triangle \(PQR\), giving your answer in the form \(k\sqrt{3}\), where \(k\) is an integer. [3 marks]
  2. By considering the roots of the equation \(z^3 = -4 + 4\sqrt{3}\text{i}\), show that $$\cos\frac{2\pi}{9} + \cos\frac{4\pi}{9} + \cos\frac{8\pi}{9} = 0$$ [4 marks]
AQA FP2 2011 June Q1
8 marks Moderate -0.3
  1. Draw on the same Argand diagram:
    1. the locus of points for which $$|z - 2 - 5i| = 5$$ [3 marks]
    2. the locus of points for which $$\arg(z + 2i) = \frac{\pi}{4}$$ [3 marks]
  2. Indicate on your diagram the set of points satisfying both $$|z - 2 - 5i| \leqslant 5$$ and $$\arg(z + 2i) = \frac{\pi}{4}$$ [2 marks]
AQA FP2 2011 June Q2
10 marks Standard +0.3
  1. Use the definitions of \(\cosh \theta\) and \(\sinh \theta\) in terms of \(e^\theta\) to show that $$\cosh x \cosh y - \sinh x \sinh y = \cosh(x - y)$$ [4 marks]
  2. It is given that \(x\) satisfies the equation $$\cosh(x - \ln 2) = \sinh x$$
    1. Show that \(\tanh x = \frac{5}{4}\). [4 marks]
    2. Express \(x\) in the form \(\frac{1}{2} \ln a\). [2 marks]
AQA FP2 2011 June Q3
6 marks Standard +0.8
  1. Show that $$(r + 1)! - (r - 1)! = (r^2 + r - 1)(r - 1)!$$ [2 marks]
  2. Hence show that $$\sum_{r=1}^{n} (r^2 + r - 1)(r - 1)! = (n + 2)n! - 2$$ [4 marks]
AQA FP2 2011 June Q4
14 marks Standard +0.8
The cubic equation $$z^3 - 2z^2 + k = 0 \quad (k \neq 0)$$ has roots \(\alpha\), \(\beta\) and \(\gamma\).
    1. Write down the values of \(\alpha + \beta + \gamma\) and \(\alpha\beta + \beta\gamma + \gamma\alpha\). [2 marks]
    2. Show that \(\alpha^2 + \beta^2 + \gamma^2 = 4\). [2 marks]
    3. Explain why \(\alpha^3 - 2\alpha^2 + k = 0\). [1 mark]
    4. Show that \(\alpha^3 + \beta^3 + \gamma^3 = 8 - 3k\). [2 marks]
  1. Given that \(\alpha^4 + \beta^4 + \gamma^4 = 0\):
    1. show that \(k = 2\); [4 marks]
    2. find the value of \(\alpha^5 + \beta^5 + \gamma^5\). [3 marks]
AQA FP2 2011 June Q5
13 marks Challenging +1.3
  1. The arc of the curve \(y^2 = x^2 + 8\) between the points where \(x = 0\) and \(x = 6\) is rotated through \(2\pi\) radians about the \(x\)-axis. Show that the area \(S\) of the curved surface formed is given by $$S = 2\sqrt{2}\pi \int_0^6 \sqrt{x^2 + 4} \, dx$$ [5 marks]
  2. By means of the substitution \(x = 2 \sinh \theta\), show that $$S = \pi(24\sqrt{5} + 4\sqrt{2} \sinh^{-1} 3)$$ [8 marks]
AQA FP2 2011 June Q6
8 marks Standard +0.3
  1. Show that $$(k + 1)(4(k + 1)^2 - 1) = 4k^3 + 12k^2 + 11k + 3$$ [2 marks]
  2. Prove by induction that, for all integers \(n \geqslant 1\), $$1^2 + 3^2 + 5^2 + \ldots + (2n - 1)^2 = \frac{1}{3}n(4n^2 - 1)$$ [6 marks]
AQA FP2 2011 June Q7
16 marks Challenging +1.3
    1. Use de Moivre's Theorem to show that $$\cos 5\theta = \cos^5 \theta - 10 \cos^3 \theta \sin^2 \theta + 5 \cos \theta \sin^4 \theta$$ and find a similar expression for \(\sin 5\theta\). [5 marks]
    2. Deduce that $$\tan 5\theta = \frac{\tan \theta(5 - 10 \tan^2 \theta + \tan^4 \theta)}{1 - 10 \tan^2 \theta + 5 \tan^4 \theta}$$ [3 marks]
  1. Explain why \(t = \tan \frac{\pi}{5}\) is a root of the equation $$t^4 - 10t^2 + 5 = 0$$ and write down the three other roots of this equation in trigonometrical form. [3 marks]
  2. Deduce that $$\tan \frac{\pi}{5} \tan \frac{2\pi}{5} = \sqrt{5}$$ [5 marks]
AQA FP2 2016 June Q1
6 marks Standard +0.3
  1. Given that \(f(r) = \frac{1}{4r-1}\), show that $$f(r) - f(r+1) = \frac{A}{(4r-1)(4r+3)}$$ where \(A\) is an integer. [2 marks]
  2. Use the method of differences to find the value of \(\sum_{r=1}^{50} \frac{1}{(4r-1)(4r+3)}\), giving your answer as a fraction in its simplest form. [4 marks]
AQA FP2 2016 June Q2
8 marks Standard +0.3
The cubic equation \(3z^3 + pz^2 + 17z + q = 0\), where \(p\) and \(q\) are real, has a root \(\alpha = 1 + 2\mathrm{i}\).
    1. Write down the value of another non-real root, \(\beta\), of this equation. [1 mark]
    2. Hence find the value of \(\alpha\beta\). [1 mark]
  1. Find the value of the third root, \(\gamma\), of this equation. [3 marks]
  2. Find the values of \(p\) and \(q\). [3 marks]
AQA FP2 2016 June Q3
10 marks Challenging +1.3
The arc of the curve with equation \(y = 4 - \ln(1-x^2)\) from \(x = 0\) to \(x = \frac{3}{4}\) has length \(s\).
  1. Show that \(s = \int_0^{\frac{3}{4}} \frac{\sqrt{1+x^2}}{1-x^2} \, dx\). [4 marks]
  2. Find the value of \(s\), giving your answer in the form \(p + \ln N\), where \(p\) is a rational number and \(N\) is an integer. [6 marks]
AQA FP2 2016 June Q4
6 marks Standard +0.8
  1. Given that \(y = \tan^{-1} \sqrt{3x}\), find \(\frac{dy}{dx}\), giving your answer in terms of \(x\). [2 marks]
  2. Hence, or otherwise, show that \(\int_{\frac{1}{3}}^1 \frac{1}{(1+3x)\sqrt{x}} \, dx = \frac{\sqrt{3}\pi}{n}\), where \(n\) is an integer. [4 marks]
AQA FP2 2016 June Q5
12 marks Standard +0.3
  1. Find the modulus of the complex number \(-4\sqrt{3} + 4\mathrm{i}\), giving your answer as an integer. [2 marks]
  2. The locus of points, \(L\), satisfies the equation \(|z + 4\sqrt{3} - 4\mathrm{i}| = 4\).
    1. Sketch the locus \(L\) on the Argand diagram below. [3 marks]
    2. The complex number \(w\) lies on \(L\) so that \(-\pi < \arg w \leq \pi\). Find the least possible value of \(\arg w\), giving your answer in terms of \(\pi\). [2 marks]
  3. Solve the equation \(z^3 = -4\sqrt{3} + 4\mathrm{i}\), giving your answers in the form \(re^{\mathrm{i}\theta}\), where \(r > 0\) and \(-\pi < \theta \leq \pi\). [5 marks]
AQA FP2 2016 June Q6
14 marks Challenging +1.2
  1. Given that \(y = \sinh x\), use the definition of \(\sinh x\) in terms of \(e^x\) and \(e^{-x}\) to show that $$x = \ln(y + \sqrt{y^2 + 1}).$$ [4 marks]
  2. A curve has equation \(y = 6\cosh^2 x + 5\sinh x\).
    1. Show that the curve has a single stationary point and find its \(x\)-coordinate, giving your answer in the form \(\ln p\), where \(p\) is a rational number. [5 marks]
    2. The curve lies entirely above the \(x\)-axis. The region bounded by the curve, the coordinate axes and the line \(x = \cosh^{-1} 2\) has area \(A\). Show that $$A = a\cosh^{-1} 2 + b\sqrt{3} + c$$ where \(a\), \(b\) and \(c\) are integers. [5 marks]
AQA FP2 2016 June Q7
6 marks Standard +0.3
Given that \(p \geq -1\), prove by induction that, for all integers \(n \geq 1\), $$(1 + p)^n \geq 1 + np$$ [6 marks]
AQA FP2 2016 June Q8
13 marks Challenging +1.8
  1. By applying de Moivre's theorem to \((\cos \theta + \mathrm{i} \sin \theta)^4\), where \(\cos \theta \neq 0\), show that $$(1 + \mathrm{i} \tan \theta)^4 + (1 - \mathrm{i} \tan \theta)^4 = \frac{2\cos 4\theta}{\cos^4 \theta}$$ [3 marks]
  2. Hence show that \(z = \mathrm{i} \tan \frac{\pi}{8}\) satisfies the equation \((1 + z)^4 + (1 - z)^4 = 0\), and express the three other roots of this equation in the form \(\mathrm{i} \tan \phi\), where \(0 < \phi < \pi\). [2 marks]
  3. Use the results from part (b) to find the values of:
    1. \(\tan^2 \frac{\pi}{8} \tan^2 \frac{3\pi}{8}\); [4 marks]
    2. \(\tan^2 \frac{\pi}{8} + \tan^2 \frac{3\pi}{8}\). [4 marks]