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