2017 VCE Maths Methods Mini Test 10
Number of marks: 9
Reading time: 1 minute
Writing time: 13 minutes
Instructions – No Calculator
• Answer all questions in the spaces provided.
• Write your responses in English.
• In questions where a numerical answer is required, an exact value must be given unless otherwise specified.
• In questions where more than one mark is available, appropriate working must be shown.
• Unless otherwise indicated, the diagrams in this book are not drawn to scale.
The graph of \(f: [0, 1] \to R, f(x) = \sqrt{x}(1-x)\) is shown below.
a. Calculate the area between the graph of \(f\) and the \(x\)-axis. 2 marks
b. For \(x\) in the interval \((0, 1)\), show that the gradient of the tangent to the graph of \(f\) is \(\frac{1-3x}{2\sqrt{x}}\). 1 mark
The edges of the right-angled triangle \(ABC\) are the line segments \(AC\) and \(BC\), which are tangent to the graph of \(f\), and the line segment \(AB\), which is part of the horizontal axis, as shown below. Let \(\theta\) be the angle that \(AC\) makes with the positive direction of the horizontal axis, where \(45^\circ \le \theta \le 90^\circ\).
c. Find the equation of the line through \(B\) and \(C\) in the form \(y=mx+c\), for \(\theta = 45^\circ\). 2 marks
d. Find the coordinates of \(C\) when \(\theta = 45^\circ\). 4 marks
End of examination questions
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