Which expression is a factor of 12 x squared plus 29 x negative 8 ?

Factor 12x² + 29x − 8 by splitting the middle term: 29x = 32x − 3x. Then 12x² + 32x − 3x − 8 = 4x(3x + 8) − 1(3x + 8) = (4x − 1)(3x + 8). Therefore, 3x + 8 is a factor.

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