C. ill only 13. Determine from the following that is true about quadratic equation? IF b4ac0 then there are two distinct real roots IL I b4ac is a perfect square, then the two roots are real, rational and unequal III. If b4ac is not perfect square, then the two roots are real irrational and unequal All only B. I only D. I, II and III 14. What is the sum and product of the roots of the quadratic equation 3x 15x 21 0? A. 15 & 21 B. 587 C. 58.7 D. 5 & 7 15. Solve 1 10. 4 A 107 207 + 200 0 B. 8x4 - 25x+ 200 0 C. 8x + 25x - 2000 . 10x2.- 20 - 2000​