The axis of symmetry for the graph of the function f of x is equal to 3 x squared plus b x plus 4 is x is equal to 3 halves What is the value of b ?

For a quadratic function ax² + bx + c, the axis of symmetry is x = −b/(2a). Here a = 3, so −b/6 = 3/2. Multiplying both sides by 6 gives −b = 9, so b = −9. The correct choice is negative 9.

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