You can
put this solution on YOUR website!Hope your question is as follows...
Here you can use the law of exponents, that is
That is ,

=
==>

, which is the answer.....
For the second question:

here first of all collect the like terms together(means like variable)
==>

=

you can write b =
==>
==>

, which is the answer...
Hope you found the explanation useful....
Regards.
Praseena.