Answer
$64$
Work Step by Step
$\lim _{t\rightarrow \dfrac {3}{2}}\left( 4t^{2}+8t-5\right) ^{3/2}=\left( 4\times \left( \dfrac {3}{2}\right) ^{2}+8\times \dfrac {3}{2}-5\right) ^{3/2}=\left( 9+12-5\right) ^{3/2}=16^{3/2}=64$
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