If \( a x^{2}+b x+c \) is exactly divisible by \( 4 x+5 \), then
(a) \( 25 a-5 b+16 c=0 \).
(b) ...
If \( a x^{2}+b x+c \) is exactly divisible by \( 4 x+5 \), then
(a) \( 25 a-5 b+16 c=0 \).
(b) \( 25 a+20 b+16 c=0 \).
(c) \( 25 a-20 b-16 c=0 \).
(d) \( 25 a-20 b+16 c=0 \).
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