The complete set of values of \( b \) for which the equation \( 2 \log _{1 / 25}(b x+28)=-\log...
The complete set of values of \( b \) for which the equation \( 2 \log _{1 / 25}(b x+28)=-\log _{5}\left(12-4 x-x^{2}\right) \) has only one solution.
(a) \( (-\infty,-14) \cup\left[\frac{14}{3}, \infty\right) \cup\{4\} \)
(b) \( (-\infty,-14) \cup\{4\} \cup\left[\frac{14}{3}, \infty\right) \cup\{-12\} \)
(c) \( (-\infty,-14) \cup\left[\frac{14}{3}, \infty\right) \cup\{-12\} \)
\( \left(\right. \) d) \( (-\infty,-14) \cup\left[\frac{14}{3}, \infty\right) \)
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