Brian is solving the equation 8x^2=15-3x with the quadratic formula. Which values could he use for a, b, and c?

a = 8, b = 3, c = - 15

a = 8, b = -15 , c = 3

a = 8, b = 15, c = - 3

a = 8, b = - 3, c = 15

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