First we solve the exponents inside the parantheses following PEMDAS.
(5.1*10^3)*(3.2*10^3)
The answer is 1000 for both exponents but hang with me cause were not done yet.
(5.1*1000)*(3.2*1000)
You can multiply either one of the prantheses but fo this case were going to do the one on the left first.
5100*(3.2*1000)
Then on to the next.
5100*3200
And finally multiply.
16320000 is the final answer! Hope this helps!