C

9000028402

Level: 
C
Find the condition which is equivalent to the fact that the equation \(ax^{2} + bx + c = 0\) with \(x\in \mathbb{R}\) and real coefficients \(a\), \(b\), \(c\) has two real solutions satisfying \(x_{1} = 0\) and \(x_{2}\neq 0\).
\(c = 0\text{ and }a\not = 0\text{ and }b\not = 0\)
\((a = b = 0)\text{ and }c\not = 0\)
\(a\not = 0\text{ and }c = 0\)
\(b\not = 0\text{ and }c = 0\)

9000028401

Level: 
C
Find the condition which is equivalent to the fact that the equation \(ax^{2} + bx + c = 0\) with \(x\in \mathbb{R}\) and real coefficients \(a\), \(b\), \(c\) has at least one real solution.
\((b^{2} - 4ac\geq 0\text{ and }a\not = 0)\text{ or }(a = 0\text{ and }b\not = 0)\text{ or }(a = b = c = 0)\)
\(a\not = 0\text{ and }b^{2} - 4ac\geq 0\)
\(b^{2} - 4ac\leq 0\)
\((b^{2} - 4ac\geq 0\text{ and }a\not = 0)\text{ or }(a = 0)\text{ or }(b = 0)\)

9000031110

Level: 
C
Solve the following system of equations and identify a correct statement. \[\begin{aligned} \left |x - 2\right | & = y & & \\\left |y + 2\right | & = x - 6 & & \end{aligned}\]
The system has no solution.
The system has a unique solution.
The system has two solutions.
The system has more than two solutions.

9000026008

Level: 
C
In the picture, the shaded region corresponds to the set of points that is the solution to one of the given systems of inequalities. Which of the systems is it?
\(\begin{aligned}2x - y&\leq 2 & \\2x + y&\geq - 2 \\ \end{aligned}\)
\(\begin{aligned}2x - y&\geq 2 & \\2x + y&\geq - 2 \\ \end{aligned}\)
\(\begin{aligned}2x - y&\leq 2 & \\2x + y&\leq - 2 \\ \end{aligned}\)
\(\begin{aligned}2x - y&\geq 2 & \\2x + y&\leq - 2 \\ \end{aligned}\)

9000026009

Level: 
C
In the picture, the shaded region corresponds to the set of points that is the solution to one of the given systems of inequalities. Which of the systems is it?
\(\begin{aligned}2y -\phantom{ 2}x& < 4& \\x - 2y & < 2 \\ \end{aligned}\)
\(\begin{aligned}2y -\phantom{ 2}x& < 4& \\x - 2y & > 2 \\ \end{aligned}\)
\(\begin{aligned}2y - x& > 4 & \\2y - x& < -2 \\ \end{aligned}\)
\(\begin{aligned}2y - x& > 4 & \\2y - x& > -2 \\ \end{aligned}\)

9000026010

Level: 
C
In the picture, the shaded region corresponds to the set of points that is the solution to one of the given systems of inequalities. Which of the systems is it?
\(\begin{aligned}x &\leq 3 & \\5x& < 9 - 3y \\ \end{aligned}\)
\(\begin{aligned}x & < 3 & \\5x& < 9 - 3y \\ \end{aligned}\)
\(\begin{aligned}x & > 3 & \\5x& < 9 - 3y \\ \end{aligned}\)
\(\begin{aligned}x &\leq 3 & \\5x& > 9 - 3y \\ \end{aligned}\)

9000025808

Level: 
C
In the following list identify a true statement on the function \(f\). \[ f(x) = \frac{(x - 1)(x + 2)} {(2x + 1)(3 - 2x)} \]
\(f(x) > 0 \iff x\in \left (-2;-\frac{1} {2}\right )\cup \left (1; \frac{3} {2}\right )\)
\(f(x) > 0 \iff x\in (-\infty ;-2)\cup \left (-\frac{1} {2};1\right )\cup \left (\frac{3} {2};\infty \right )\)
\(f(x) > 0 \iff x\in (-\infty ;-2)\cup (1;\infty )\)
\(f(x) > 0 \iff x\in \left (-2; \frac{3} {2}\right )\)

9000025809

Level: 
C
In the following list identify a true statement on the function \(f\). \[ f(x)= \frac{(6x - 1)} {(x - 2)(3x + 1)} \]
\(f(x)\geq 0 \iff x\in \left (-\frac{1} {3}; \frac{1} {6}\right ] \cup (2;\infty )\)
\(f(x)\geq 0 \iff x\in \left (-\frac{1} {3}; \frac{1} {6}\right )\cup (2;\infty )\)
\(f(x)\geq 0 \iff x\in \left (-\infty ;-\frac{1} {3}\right )\cup \left [ \frac{1} {6};2\right )\)
\(f(x)\geq 0 \iff x\in \left [ -\frac{1} {3}; \frac{1} {6}\right ] \cup (2;\infty )\)

9000025810

Level: 
C
In the following list identify a true statement on the function \(f\). \[ f(x) = \frac{(x - 2)(3 - x)} {(2x - 1)(3x - 1)} \]
\(f(x)\geq 0 \iff x\in \left (\frac{1} {3}; \frac{1} {2}\right )\cup [ 2;3] \)
\(f(x)\geq 0 \iff x\in \left [ \frac{1} {3}; \frac{1} {2}\right ] \cup [ 2;3] \)
\(f(x)\geq 0 \iff x\in \left (-\infty ; \frac{1} {3}\right )\cup \left [ \frac{1} {2};2\right ] \cup [ 3;\infty )\)
\(f(x)\geq 0 \iff x\in \left (\frac{1} {3}; \frac{1} {2}\right )\cup (2;3)\)