Answer
$6$
Work Step by Step
$\lim _{x\rightarrow \dfrac {1}{2}}\left( 4x+1\right) \left( 6x-1\right) =\left( 4\times \dfrac {1}{2}+1\right) \left( 6\times \dfrac {1}{2}-1\right) =3\times 2=6$
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