Answer:
403200
Explanation:
Factorial is the product of all positive integers less than or equal to a given number. 8! and 9! are factorials of 8 and 9 respectively.
8! = 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 40320
9! = 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 362880
8! + 9! = 40320 + 362880 = 403200
Therefore, the simplified factorial of 8! + 9! is 403200.