Examples: x^2+3x-5 * 0, -2x^2+4x+2 ≤ 0, x^2-5x ≥ 0, -3x^2+4x+2 * 0. Solving the quadratic inequalities:1. Calculate delta. 2. Find roots if exist. 3. Draw parabola which crosses x-axis in roots: for a * 0 open up, for a * 0 open down. 4. Mark green for signs: * ≤ part of a graph belowe x-axis, * ≥ part of a graph above x-axis. 5. For signs: ≤ ≥ draw full circl in roots, * * draw open circle in roots. 6. Draw interval correspond to green part of a graph. 7. Write solution.