Question

One of the solutions to the equation 5x^2+bx+12=0 is -4/5. Find the value of b.

Answer 1

Step-by-step explanation:

Answer 2

19

Explanation:

Substitute x = -4/5 and solve for b.

5x² + bx + 12 = 0

5(-4/5)² + b(-4/5) + 12 = 0

16/5 − 4/5 b + 12 = 0

16 − 4b + 60 = 0

4b = 76

b = 19