Solve |quadratic| compared to linear: algebraic inequality

Use algebra to find the set of values of x for which modulus of a quadratic expression is greater than or less than a linear expression, e.g. |x²-2| > 4x or |2x²+x-3| > 3(1-x).

13 questions · Standard +0.9

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Edexcel F2 2021 January Q3
7 marks Standard +0.8
3. Use algebra to obtain the set of values of \(x\) for which $$\left| x ^ { 2 } + x - 2 \right| < \frac { 1 } { 2 } ( x + 5 )$$
Edexcel F2 2022 January Q3
11 marks Standard +0.8
3. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{0d458344-42cb-48d1-90b3-e071df8ea7bb-08_693_987_116_482} \captionsetup{labelformat=empty} \caption{Figure 1}
\end{figure} Figure 1 shows a sketch of the curve \(C _ { 1 }\) with equation $$y = \frac { 4 x } { 4 - | x | }$$ and the curve \(C _ { 2 }\) with equation $$y = x ^ { 2 } - 8 x$$ For \(x > 0 , C _ { 1 }\) has equation \(y = \frac { 4 x } { 4 - x }\)
  1. Use algebra to show that \(C _ { 1 }\) touches \(C _ { 2 }\) at a point \(P\), stating the coordinates of \(P\)
  2. Hence or otherwise, using algebra, solve the inequality $$x ^ { 2 } - 8 x > \frac { 4 x } { 4 - | x | }$$
Edexcel F2 2023 January Q5
6 marks Challenging +1.2
  1. In this question you must show all stages of your working.
Solutions relying entirely on calculator technology are not acceptable.
Use algebra to determine the set of values of \(x\) for which $$\frac { x ^ { 2 } - 9 } { | x + 8 | } > 6 - 2 x$$
Edexcel F2 2016 June Q2
6 marks Standard +0.8
2. Use algebra to find the set of values of \(x\) for which $$\left| x ^ { 2 } - 9 \right| < | 1 - 2 x |$$
Edexcel F2 2020 June Q3
9 marks Challenging +1.2
3. Use algebra to obtain the set of values of \(x\) for which $$\left| \frac { x ^ { 2 } + 3 x + 10 } { x + 2 } \right| < 7 - x$$
Edexcel F2 2021 June Q5
7 marks Standard +0.8
  1. Use algebra to find the set of values of \(x\) for which
$$\left| 2 x ^ { 2 } + x - 3 \right| > 3 ( 1 - x )$$ [Solutions based entirely on graphical or numerical methods are not acceptable.] \includegraphics[max width=\textwidth, alt={}, center]{0d44aec7-a6e8-47fc-a215-7c8c4790e93f-21_2647_1840_118_111}
Edexcel FP2 2004 June Q6
7 marks Standard +0.8
6. Find the complete set of values of \(x\) for which $$\left| x ^ { 2 } - 2 \right| > 2 x$$
Edexcel FP2 2007 June Q2
9 marks Standard +0.8
2. \includegraphics[max width=\textwidth, alt={}, center]{d6befd60-de40-41b6-8ae5-48656dbca40c-1_734_1228_888_479} The diagram above shows a sketch of the curve with equation $$y = \frac { x ^ { 2 } - 1 } { | x + 2 | } , \quad x \neq - 2$$ The curve crosses the \(x\)-axis at \(x = 1\) and \(x = - 1\) and the line \(x = - 2\) is an asymptote of the curve.
  1. Use algebra to solve the equation \(\frac { x ^ { 2 } - 1 } { | x + 2 | } = 3 ( 1 - x )\).
  2. Hence, or otherwise, find the set of values of \(x\) for which $$\frac { x ^ { 2 } - 1 } { | x + 2 | } < 3 ( 1 - x )$$ (Total 9 marks)
Edexcel FP2 2012 June Q1
5 marks Standard +0.8
  1. Find the set of values of \(x\) for which
$$\left| x ^ { 2 } - 4 \right| > 3 x$$
Edexcel FP2 2014 June Q2
6 marks Standard +0.8
2. Use algebra to find the set of values of \(x\) for which $$\left| 3 x ^ { 2 } - 19 x + 20 \right| < 2 x + 2$$
Edexcel FP2 2018 June Q4
7 marks Challenging +1.2
4. Use algebra to find the set of values of \(x\) for which $$\left| x ^ { 2 } - 2 \right| > 4 x$$
AQA C3 2016 June Q3
5 marks Standard +0.8
3 Solve $$x ^ { 2 } \geqslant | 5 x - 6 |$$ [5 marks]
Edexcel FP2 Q29
7 marks Standard +0.8
Find the complete set of values of \(x\) for which $$|x^2 - 2| > 2x.$$ [7]