1. Which of the following is the discriminant of the quadratic equation x² + bx + c = 0, where a, b, c are real number and a # 0 a vb² - 4ac b. 5° - 4ac d. -b+86² - 4ac

2. If the discriminant of the quadratic equation is zero, what is the nature of its roots? a Roots are not real cRoots are rational and not equal b. Roots are rational and equal d Roots are irrational and not equal

3. If the value of its discriminant is positive and not a perfect square, what is the nature of its roots? a Roots are not real C. Roots are rational and not equal b. Roots are rational and equal d Roots are irrational and not equal

4. What is the discriminant of the quadratic equation x² + 2x + 5 = 0? a. 4 b. 16 C-4 d -16​