B

9000033704

Level: 
B
Find the values of real parameter \(p\) which ensure that the following quadratic equation has solutions with nonzero imaginary part. \[ px^{2} + 4x - p + 5 = 0 \]
\(p\in \left (1;4\right )\)
\(p\in [ 1;4] \)
\(p\in \left (-\infty ;1\right )\cup \left (4;\infty \right )\)
\(p\in \left (-\infty ;1\right ] \cup \left [ 4;\infty \right )\)

9000031210

Level: 
B
Given complex numbers \(z_{1} = 2\sqrt{3}\left (\cos \frac{\pi }{6} + \mathrm{i}\sin \frac{\pi }{6}\right )\) and \(z_{2} = \sqrt{3}\left (\cos \frac{4\pi } {3} + \mathrm{i}\sin \frac{4\pi } {3}\right )\), find the quotient \(\frac{z_{1}} {z_{2}} \).
\(-\sqrt{3} + \mathrm{i}\)
\(\sqrt{3} -\mathrm{i}\)
\(\sqrt{3} + \mathrm{i}\)
\(-\sqrt{3} -\mathrm{i}\)

9000031209

Level: 
B
Given complex numbers \(z_{1} = 2\sqrt{2}\left (\cos \frac{\pi }{4} + \mathrm{i}\sin \frac{\pi }{4}\right )\) and \(z_{2} = \sqrt{2}\left (\cos \frac{7\pi } {4} + \mathrm{i}\sin \frac{7\pi } {4}\right )\), find the product \(z_{1}z_{2}\).
\(4\)
\(4\mathrm{i}\)
\(- 4\mathrm{i}\)
\(- 4\)