Řeš v ℝ rovnice:
\large x^{2}-2 x-3 = 0
K = \left\{ { 1;\ \left. 3 \right\}} \right.
K = \left\{ { – 1;\ \left. -3 \right\}} \right.
K = \left\{ { – 1;\ \left. 3 \right\}} \right.
K = \left\{ { 0;\ \left. 3 \right\}} \right.