Respuesta :

Answer:

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Step-by-step explanation:

If one of the solutions is - 4/5....put that value in for 'x' to compute 'b'

5 (-4/5)^2 + (-4/5) b +12 = 0

80/25  + 12   = 4/5 b

5/4 ( 80/25 + 12 ) = b = 19