Equations and inequalities with parameters

9000104502

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

9000104307

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

9000034705

Level: 
B
Solve the inequality \[ 2x + b > 0 \] with a real unknown \(x\) and a real parameter \(b\in \mathbb{R}\).
\(\left (-\frac{b} {2};\infty \right )\)
\(\left (\frac{b} {2};\infty \right )\)
\(\left (-\infty ; \frac{b} {2}\right )\)
\(\left (-\infty ;-\frac{b} {2}\right )\)

9000034701

Level: 
B
Identify a set of the values of the real parameter \(m\) which ensure that the equation \[ \frac{m} {x} - 8 = \frac{1} {x} -\frac{m + 3} {2} \] has solution \(x = 2\).
\(\left \{7\right \}\)
\(\left \{10\right \}\)
\(\left \{6\right \}\)
\(\left \{\frac{5} {2}\right \}\)