\( a \) is a root of the equation \( 2 x(2 x+1)=1 \), then the other
(A) \( 3 a^{3}-4 a \)
(B) \... VIDEO
\( a \) is a root of the equation \( 2 x(2 x+1)=1 \), then the other
(A) \( 3 a^{3}-4 a \)
(B) \( -2 \alpha(\alpha+1) \)
(C) \( 4 \alpha^{3}-3 \alpha \)
(D) none of these
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