Question 952381
{{{b^4=b^4}}}
'
{{{b^4/b=(b/b)b^3=b^3}}}
'
{{{b^4/(b^2)=(b^2/b^2)b^2=b^2}}}
'
{{{b^4/b^3=(b^3/b^3)b=b^1=b}}}
'
{{{b^4/b^4=1}}}


We also have a rule about integer valued exponents:
{{{b^x/b^y=b^(x-y)}}} which you will be able to compare with the successive examples just shown.


Briefly, look at {{{b^4/b^4=b^(4-4)=b^0=1}}}, because {{{b^4/b^4=1}}}.