solver91311 showed you how to do it the way you were
trying it. You can indeed get the answer the way you're 
trying and the way solver91311 showed you, if you don't 
make a mistake.  But you aren't supposed to do it that
way!  Here's the way you're supposed to do it:



Write  as 



Consider  as 



Remove the parentheses by multiplying
the two inner exponents by the outer exponent:



Do the actual multiplying:



Since , replace  by 



But that is not scientific notation because
 is greater than , and the first part
of scientific notation must be between  and , inclusive
of 1 but exclusive of .  So write  in scientific
notation as :



Add the exponents of 10



Do the actual addition:



Edwin