Question 947583

Could someone help me on this problem because I don't understand how to solve this, I also do not know if this is an easy problem.

For what value is w is b^-w=1/b^9 if b (doesn't equal sign) 0?
<pre>
{{{b^(- w) = 1/b^9}}}, with {{{b <> 9}}}
{{{1/b^w = 1/b^9 }}}
Therefore, {{{b^w = b^9}}}, and so, {{{highlight_green(w = 9)}}}