Kvadratické rovnice v obore komplex. čísel

1003107506

Časť: 
C
Určte komplexné korene danej kvadratickej rovnice. \[ 9x^2 + 4\mathrm{i} = 0 \]
\( x_1=-\frac{\sqrt2}3+\frac{\sqrt2}3\mathrm{i}\text{, }\ x_2=\frac{\sqrt2}3-\frac{\sqrt2}3\mathrm{i} \)
\( x_1=\frac23\mathrm{i}\text{, }\ x_2=-\frac23\mathrm{i} \)
\( x_1=\frac{\sqrt2}3+\frac{\sqrt2}3\mathrm{i}\text{, }\ x_2=-\frac{\sqrt2}3-\frac{\sqrt2}3\mathrm{i} \)
\( x_1=\frac23\text{, }\ x_2=-\frac23 \)

1003107505

Časť: 
C
Určte komplexné korene danej kvadratickej rovnice. \[ 4\mathrm{i}x^2 + 1 = 0 \]
\( x_1=\frac{\sqrt2}4+\frac{\sqrt2}4\mathrm{i}\text{, }\ x_2=-\frac{\sqrt2}4-\frac{\sqrt2}4\mathrm{i} \)
\( x_1=-\frac{\sqrt2}4+\frac{\sqrt2}4\mathrm{i}\text{, }\ x_2=\frac{\sqrt2}4-\frac{\sqrt2}4\mathrm{i} \)
\( x_1=\frac12+\frac12\mathrm{i}\text{, }\ x_2=-\frac12-\frac12\mathrm{i} \)
\( x_1=-\frac12+\frac12\mathrm{i}\text{, }\ x_2=\frac12-\frac12\mathrm{i} \)

1003107504

Časť: 
C
Určte komplexné korene danej kvadratickej rovnice. \[ 16\mathrm{i}x^2 - 9\mathrm{i}^3 = 0 \]
\( x_1=\frac34\mathrm{i}\text{, }\ x_2=-\frac34\mathrm{i} \)
\( x_1=\frac34\text{, }\ x_2=-\frac34\)
\( x_1=\frac43\mathrm{i}\text{, }\ x_2=-\frac43\mathrm{i} \)
\( x_1=\frac43\text{, }\ x_2=-\frac43 \)

1003107503

Časť: 
C
Určte komplexné korene danej kvadratickej rovnice. \[ (3-\mathrm{i})x^2-(1-2\mathrm{i})x = 0 \]
\( x_1=0\text{, }\ x_2=\frac12-\frac12\mathrm{i} \)
\( x_1=0\text{, }\ x_2=-\frac12+\frac12\mathrm{i} \)
\( x_1=0\text{, }\ x_2=\frac12+\frac12\mathrm{i} \)
\( x_1=0\text{, }\ x_2=-\frac12-\frac12\mathrm{i} \)

1003107501

Časť: 
C
Určte komplexné korene kvadratickej rovnice. \[ 2\mathrm{i}\,x^2 - 5\mathrm{i}\,x = 0 \]
\( x_1=0\text{, }\ x_2 = \frac52 \)
\( x_1=0\text{, }\ x_2 = \frac52\mathrm{i} \)
\( x_1=0\text{, }\ x_2 = -\frac52 \)
\( x_1=0\text{, }\ x_2 = -\frac52\mathrm{i} \)

1003102505

Časť: 
B
Určte množinu všetkých komplexných koreňov rovnice \[ \left(x^2 - 2x + 5\right).\left(x^2 + 6x + 10\right) = 0 \]
\( \{1\pm2\mathrm{i}; -3\pm\mathrm{i} \} \)
\( \{-1\pm2\mathrm{i}; -3\pm\mathrm{i} \} \)
\( \{-1\pm2\mathrm{i}; 3\pm\mathrm{i} \} \)
\( \{1\pm2\mathrm{i}; 3\pm\mathrm{i} \} \)

1003102504

Časť: 
B
Určte množinu komplexných koreňov danej rovnice. \[ x^2 + 4x + 8 = 0 \]
\( \left\{ 2\sqrt2\left(\cos\frac{3\pi}4+\mathrm{i}\cdot\sin\frac{3\pi}4\right); 2\sqrt2\left(\cos\frac{5\pi}4+\mathrm{i}\cdot\sin\frac{5\pi}4\right) \right\} \)
\( \left\{ 2\left(\cos\frac{3\pi}4+\mathrm{i}\cdot\sin\frac{3\pi}4\right); 2\left(\cos\frac{5\pi}4+\mathrm{i}\cdot\sin\frac{5\pi}4\right) \right\} \)
\( \left\{ 2\sqrt2\left(\cos\frac{\pi}4+\mathrm{i}\cdot\sin\frac{\pi}4\right); 2\sqrt2\left(\cos\frac{7\pi}4+\mathrm{i}\cdot\sin\frac{7\pi}4\right) \right\} \)
\( \left\{ 2\left(\cos\frac{\pi}4+\mathrm{i}\cdot\sin\frac{\pi}4\right); 2\left(\cos\frac{7\pi}4+\mathrm{i}\cdot\sin\frac{7\pi}4\right) \right\} \)

1003102503

Časť: 
A
Určte komplexné korene danej kvadratickej rovnice. \[ 5x^2 + 12 = 0 \]
\( x_1=-\frac{2\sqrt{15}}5\mathrm{i}\text{, }x_2=\frac{2\sqrt{15}}5\mathrm{i} \)
\( x_1=-\frac{\sqrt{15}}5\mathrm{i}\text{, }x_2=\frac{\sqrt{15}}5\mathrm{i} \)
\( x_1=-\frac{\sqrt{12}}5\mathrm{i}\text{, }x_2=\frac{\sqrt{12}}5\mathrm{i} \)
\( x_1=-\frac{2\sqrt{3}}5\mathrm{i}\text{, }x_2=\frac{2\sqrt{3}}5\mathrm{i} \)

1003102502

Časť: 
A
Určte komplexné korene danej kvadratickej rovnice. \[ 4x^2 + 0{,}0025 = 0 \]
\( x_1=-\frac1{40}\mathrm{i}\text{, } x_2=\frac1{40}\mathrm{i} \)
\( x_1=-\frac1{4}\mathrm{i}\text{, } x_2=\frac1{4}\mathrm{i} \)
\( x_1=-\frac5{16}\mathrm{i}\text{, } x_2=\frac5{16}\mathrm{i} \)
\( x_1=-\frac5{4}\mathrm{i}\text{, } x_2=\frac5{4}\mathrm{i} \)