Equations and inequalities with parameters

9000104307

Level: 
B
Assuming \(a\in \left (0;2\right )\), solve the following inequality. \[ a\left (a - 2\right )x > 1 \]
\(\left (-\infty ; \frac{1} {a\left (a-2\right )}\right )\)
\(\left ( \frac{1} {a\left (a-2\right )};\infty \right )\)
\(\emptyset \)
\(\left \{ \frac{1} {a\left (a-2\right )}\right \}\)

9000104310

Level: 
B
Assuming \(a\in \left (0;1\right )\), solve the following inequality. \[ 2a\left (1 - a\right )x > 3 \]
\(\left ( \frac{3} {2a\left (1-a\right )};\infty \right )\)
\(\left (- \frac{3} {2a\left (1-a\right )};\infty \right )\)
\(\left (- \frac{3} {2a\left (1-a\right )}; \frac{3} {2a\left (1-a\right )}\right )\)
\(\left (-\infty ; \frac{3} {2a\left (1-a\right )}\right )\)

2000019105

Level: 
C
Consider the following equation with a parameter \( a\). \[ \frac{2x-a}{x-5}=a \] Choose the table that summarizes solutions of the equation according to the value of \(a\).
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a \in \{2;10\} & \emptyset \\ a \in \mathbb{R} \setminus \{2;10\}& \left\lbrace\frac{4a}{a-2}\right\rbrace \\\hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=5 & \emptyset \\ a \neq 5 & \left\lbrace\frac{4a}{a-2}\right\rbrace \\\hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=2 & \emptyset \\ a \neq 5 & \left\lbrace\frac{4a}{a-2}\right\rbrace \\\hline \end{array}\)

2000019106

Level: 
C
Consider the following equation with a parameter \( a\). \[ \frac{x-a}{x-3}=2a \] Choose the table that summarizes solutions of the equation according to the value of \(a\).
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a \in \left\{\frac12;3\right\} & \emptyset \\ a \in \mathbb{R} \setminus \left\{\frac12;3\right\}& \left\lbrace\frac{5a}{2a-1}\right\rbrace \\\hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a =3 & \emptyset \\ a \neq 3& \left\lbrace\frac{5a}{2a-1}\right\rbrace \\\hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=\frac12 & \emptyset \\ a \neq \frac12 & \left\lbrace\frac{5a}{2a-1}\right\rbrace \\\hline \end{array}\)

2000019109

Level: 
C
Determine the set of all values of the parameter \( a \in \mathbb{R} \setminus \{0\}\) for which the equation has a unique solution. \[ \frac{x-1}{x} = \frac{2-a}{3a} \]
\(\mathbb{R} \setminus \left\{\frac12;0\right\}\)
\(\mathbb{R} \setminus \left\{0;2;\frac12\right\}\)
\(\mathbb{R} \setminus \{0\}\)
\(\mathbb{R} \setminus \left\{\frac13;0;2;1\right\}\)

2000019110

Level: 
C
Determine the set of all values of the real parameter \( a \) for which the equation has a unique solution. \[ \frac{a(x+2)-3(x-1)}{x+1} = 1 \]
\(\mathbb{R} \setminus \{-6;4\}\)
\(\mathbb{R} \setminus \{-1;-2;1\}\)
\(\mathbb{R} \setminus \{0;-1\}\)
\(\mathbb{R} \setminus \{4\}\)

9000104503

Level: 
C
Solve the following equation with unknown \(x\) and a real parameter \(a\in\mathbb{R}\). \[\frac{a^{2}(x-1)} {ax-2} = 2\]
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=0 & \emptyset \\ a=2 & \mathbb{R}\setminus\{1\} \\ a\notin\{0;2\} & \left\lbrace\frac{a+2}a\right\rbrace \\\hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a\in\{0;2\} & \mathbb{R} \\ a\notin\{0,2\} & \left\{\frac{a+2}a\right\} \\\hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=0 & \emptyset \\ a=2 & \mathbb{R} \\ a\notin\{0;2\} & \left\lbrace\frac{a+2}a\right\rbrace \\\hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=0 & \mathbb{R}\setminus\{1\} \\ a=2 & \emptyset \\ a\notin\{0;2\} & \left\lbrace\frac{a+2}a\right\rbrace \\\hline \end{array}\)

9000104504

Level: 
C
Solve the following equation with unknown \(x\) and a real parameter \(a\in\mathbb{R}\setminus\{0\}\). \[\frac{1} {x-a} + 1 = \frac{1} {a}\]
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=1 & \emptyset \\ a\notin\{0,1\} & \left\lbrace\frac{a(a-2)}{a-1}\right\rbrace \\\hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=1 & \mathbb{R}\setminus\{1\} \\ a\notin\{0;1\} & \left\lbrace\frac{a(a-2)}{a-1}\right\rbrace \\\hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=1 & \mathbb{R} \\ a\notin\{0,1\} & \left\lbrace\frac{a(a-2)}{a-1}\right\rbrace \\\hline \end{array}\)

9000140001

Level: 
C
Consider the equation \[ \frac{4a} {x} - \frac{1} {ax} + \frac{2} {a} = 4 \] with unknown \(x\) and a parameter \(a\in \mathbb{R}\setminus \{0\}\). Identify a true statement.
If \(a = \frac{1} {2}\), then the solution is \(x\in \mathbb{R}\setminus \{0\}\).
If \(a = \frac{1} {2}\), then the equation has no solution.
If \(a = \frac{1} {2}\), then the solution is \(x\in \mathbb{R}\).

9000140004

Level: 
C
Solve the following equation with unknown \(x\) and a real parameter \(a\in\mathbb{R}\). \[ \frac{a^{2}(x-1)} {ax-3} = 3 \]
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=0 & \emptyset \\ a=3 & \mathbb{R}\setminus\{1\} \\ a\notin\{0;3\} & \left\{\frac{a+3}a\right\} \\ \hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=0 & \emptyset \\ a=3 & \{1\} \\ a\notin\{0;3\} & \left\{\frac{a+3}a\right\} \\ \hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a\in\{0;3\} & \emptyset \\ a\notin\{0;3\} & \left\{\frac{a+3}a\right\} \\ \hline \end{array}\)
\(\begin{array}{cc} \hline \text{Parameter} & \text{Solution set}\\ \hline a=0 & \emptyset \\ a=3 & \mathbb{R} \\ a\notin\{0;3\} & \left\{\frac{a+3}a\right\} \\ \hline \end{array}\)