B

9000022308

Level: 
B
Using graphs of the functions \(f(x)= -2x^{2} + 3x + 4\) and \(g(x) = x\) solve the following quadratic inequality. \[ -2x^{2} + 3x + 4\geq x \]
\(\left [ -1;2\right ] \)
\(\{ - 1;2\}\)
\(\left (-1;2\right )\)
\(\left (-\infty ;-1\right )\cup \left (2;\infty \right )\)

9000022309

Level: 
B
Using graphs of the functions \(f(x) = x^{2} + x - 1\) and \(g(x) = -\frac{1} {2}x\) solve the following quadratic inequality. \[ x^{2} + x - 1 > -\frac{1} {2}x \]
\(\left (-\infty ;-2\right )\cup \left (\frac{1} {2};\infty \right )\)
\(\left (-2; \frac{1} {2}\right )\)
\(\left [ -2; \frac{1} {2}\right ] \)
\(\left (-\infty ;-2\right ] \cup \left [ \frac{1} {2};\infty \right )\)

9000022803

Level: 
B
Establish the values of the parameter \(t\) which ensure that the equation \[ x^{2} + tx + t + 8 = 0 \] with an unknown \(x\) has complex solutions with a nonzero imaginary part.
\(\left (-4;8\right )\)
\(\left [ -4;8\right ] \)
\(\left (-\infty ;-4\right )\cup \left (8;\infty \right )\)
\(\left (-\infty ;-4\right ] \cup \left [ 8;\infty \right )\)

9000022304

Level: 
B
Find all the values of \(x\) at which the following expression attains nonnegative value. \[ x^{2} + x - 12 \]
\(x\in \left (-\infty ;-4\right ] \cup \left [ 3;\infty \right )\)
\(x\in \left [ -3;4\right ] \)
\(x\in \left [ -4;3\right ] \)
\(x\in \left (-\infty ;-4\right )\cup \left (3;\infty \right )\)
\(x\in \left (-\infty ;-3\right ] \cup \left [ 4;\infty \right )\)

9000020902

Level: 
B
The solution of the given set of equations can be interpreted as the intersection of the curves shown in the figure. Find the solution of the system in \(\mathbb{R}\times \mathbb{R}\). \[ \begin{alignedat}{80} &4x^{2} & + &y &^{2} & = &20 & & & & & & & & & \\ &2x & + &y & & = &6 & & & & & & & & & \\\end{alignedat}\]
\([1;4],\ [2;2]\)
\([2;2]\)
\([1;4]\)
no solution