The set of values of \( b \) for which \( 2 \log _{1 / 36}(b x+28)=...
The set of values of \( b \) for which \( 2 \log _{1 / 36}(b x+28)=-\log _{6}\left(12-4 x-x^{2}\right) \) has exactly one solution is
(a) \( (-\infty,-14) \cup[14 / 3, \infty) \)
(b) \( [14 / 9, \infty) \)
(c) \( (-\infty,-14) \cup\{4\} \cup(14 / 3, \infty) \)
(d) \( \{4\} \)
(W)
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