Question

If z=1/2 what is the value of z^-6z^4?

Answer 1

\[z^{-6}z^4=z^{-6+4}=z^{-2}=\frac{1}{z^2}\]

Answer 2

if you replace z by
\[\frac{1}{2}\] you will get 4

Answer 3

\[z^{-6}z^4=z^{-6+4}=z^{-2}\]
If z=1/2, this becomes
\[\left(\frac{1}{2}\right)^{-2}=(2^{-1})^{-2}=2^2=4\]