Simplify the expression. anyone know the answer to this?

1814400

Step-by-step explanation:

This is a permutation.  It means 10 objects taken 8 at a time.    Order of the objects matters in permutations.

The formula for permutations

 n P r  = n ! / ( n − r ) !    ! means factorial

where n is the number of items and r is the number of objects taken together  

10P8 = 10! / (10-8) !

        = 10! / 2!

         =1814400