Question

If the sum of the roots of the quadratic equation $5x^2+bx+4=0 is 9, the find the value of b.

• A. 0
• B. 20
• C. -45
• D. -25

Answer 1

Answer:

C. -45

.Sum of roots = -b / a a = 5 b = b (the value we need to find) c = 4 -b / 5 = 9 -b = 45 b = -45