Question 639140
{{{  25x^2 - 24x = 0 }}}
{{{  x(25x - 24) = 0 }}}
Use a property of zero
{{{x=0}}} or {{{25x-24=0}}}
{{{x=0}}} or {{{x=0.96}}}
.
.
 {{{f(y)= (y+8)/(y^2-8y )}}}
The domain is {{{y^2-8y<>0}}} 
solve {{{y^2-8y=0}}} 
{{{y(y-8)=0}}} 
{{{y=0}}} or {{{y-8=0}}}
Hence
{{{y<>0}}} or {{{y<>8}}}
D(f) ({{{-infinity}}},0)U(0,8)U(8,{{{infinity}}})