Mark is solving the equation 4x2 + 2x = -9 using the quadratic formula.

which values could he use for a, b and c?

question 6 options:

a = 4, b = 2, c = -9

a = 4, b = -9, c = 2

a = 4, b = 2, c = 9

a = 4, b = 9, c = -2

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