$$\frac{ 3 }{ 8 } { a }^{ 3 } + \frac{ 5a }{ 8 } - \frac{ 1 }{ 4 } a$$
$\frac{3a\left(a^{2}+1\right)}{8}$
$$\frac{3a^{3}+5a-2a}{8}$$
$$a\left(3a^{2}+3\right)$$
$$3a^{2}+3$$
$$3\left(a^{2}+1\right)$$
$$\frac{3a\left(a^{2}+1\right)}{8}$$
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