Which is a zero of the quadratic function f of x is equal to 16 x squared plus 32 x minus 9 ?

Set the function equal to zero: 16x² + 32x − 9 = 0. Using the quadratic formula gives x = (−32 ± √1600) / 32, so the roots are 0.25 and −2.25. Therefore, −2.25 is a zero, which is choice B.

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