the binomial expansion of \( (a+b x)^{-2} \) is \( \frac{1}{4}-3 x+\ldots \) then \( (a, b)= \)
...
the binomial expansion of \( (a+b x)^{-2} \) is \( \frac{1}{4}-3 x+\ldots \) then \( (a, b)= \)
(A) \( (2,12) \)
(B) \( (2,8) \)
(C) \( (-2,-12) \)
(D) none of these
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