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lf one factor of $5 + 8 x - 4 x^{2}$ is $(2 x + 1)$ then the second factor is

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$- (5 + 2 x)$

$(5 + 2 x)$

$(5 - 2 x)$

$(2 x - 5)$

answer is B.

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$5 + 8 x - 4 x^{2} = (2 x + 1) (2 x - 5)$

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