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

Question

asked Oct 22, 2024 96.3k views

2 Answers

Grrrrrr · Answer 1 · 2024-10-27T07:41:49+0000

Answer:

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