Question 282821
It depends !
Does it mean
z^2-(64/8)-z
{{{z^2-(64/8)-z}}}
If that is the expression then yes you did it right.
`
or (z^2-64)/(8-z)
{{{(z^2-64)/(8-z)}}}
if this is the expression (most likely) then no.
It can be factored into
(z-8)(z+8)/-(z-8)

{{{(z-8)(z+8)/(-1*(z-8))}}}
-(z+8)
-z-8

Now you see why parentheses are so important.
Use them freely they are free