Respuesta :

Let's use the following properties:

[tex]\begin{gathered} (x^y)^z=x^{y\cdot z} \\ ----^{} \\ a^{-x}=\frac{1}{a^x} \\ x\ne0 \end{gathered}[/tex]

so:

[tex](b^2)^{-4}=b^{2\cdot(-4)}=b^{-8}=\frac{1}{b^8}[/tex]