$${ \left( \frac{ -5 }{ 2 } \right) }^{ 3 } +3 { \left( \frac{ -5 }{ 2 } \right) }^{ 2 } +3( \frac{ -5 }{ 2 } )+1$$
$-\frac{27}{8}=-3.375$
$$\left(-\frac{5}{2}\right)^{3}+3\times \left(\frac{-5}{2}\right)^{2}+3\times \frac{-5}{2}+1$$
$$-\frac{125}{8}+3\times \left(\frac{-5}{2}\right)^{2}+3\times \frac{-5}{2}+1$$
$$-\frac{125}{8}+3\left(-\frac{5}{2}\right)^{2}+3\times \frac{-5}{2}+1$$
$$-\frac{125}{8}+3\times \frac{25}{4}+3\times \frac{-5}{2}+1$$
$$-\frac{125}{8}+\frac{75}{4}+3\times \frac{-5}{2}+1$$
$$\frac{25}{8}+3\times \frac{-5}{2}+1$$
$$\frac{25}{8}+3\left(-\frac{5}{2}\right)+1$$
$$\frac{25}{8}-\frac{15}{2}+1$$
$$-\frac{35}{8}+1$$
$$-\frac{27}{8}$$
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$-\frac{27}{8} = -3\frac{3}{8} = -3.375$
