If \( a x^{4}+b x^{3}+c x^{2}+d x \) is exactly divisible by \( x^{2}- \) \( 4, \operatorname{th...
If \( a x^{4}+b x^{3}+c x^{2}+d x \) is exactly divisible by \( x^{2}- \) \( 4, \operatorname{then} \frac{a}{c} \) is
(a) \( \frac{1}{4} \)
(b) \( \frac{-1}{4} \)
(c) \( \frac{-1}{8} \)
(d) \( \frac{1}{8} \)
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