D. 3х2 - 6x < 13 II. PROBLEM SOLVING. Show all solutions. 16- 20. Solve the following quadratic equation. a.) 4x2 + 16x + 15 +0 21. Describe the roots of the following quadratic equation. a.) x2 - 4x + 4 = 0 22- 24. Find the sum and product of the following quadratic equation. a.) 2x2 + 8x - 10 - 0 25-30. Sketch the graph of the quadratic function f(x) = 2x2 + 4x - 3 Note: Use a graphing paper, GOD BLESS...​