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

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B20

C-45

D-25

Answer:

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

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