Question

Evaluate the expression. 9! − 5!

Answer 1

The ! sign in mathematics means factorial.
This is the product of a number and below it until 1.
In mathematical language
a! = a * (a - 1)! 

So,
5! = 5 * 4 * 3 * 2 * 1 = 120
9! = 9 * 8 * 7 * 6 * 5 *4 *3 * 2 *1 = 326 880

Therefore 9! - 5! = 326 880 - 120 = 326 760

Answer 2

! means factorial, if you did not already know. It means multiply together all the numbers leading up to that number. For example, 4! = 4x3x2x1 = 24
Evaluate means just solve it.
9! = 9x8x7x6x5x4x3x2x1 = 362880
5! = 5x4x3x2x1 = 120
362880 - 120 = 362760
There is your answer