Answer:
The product is the difference of squares is 
Step-by-step explanation:
Explanation
- The given expression is (m-7)(m+7).
- We have to multiply the given expression.
- Square the first term m. Square the last term 7 .

1st character = 26 possibilities ( 26 letters in the alphabet)
2nd character = 26 possibilities
3rd character = 26 possibilities
4th character = 10 ( 10 special characters)
26 x 26 x 26 x 10 = 175,760 combinations
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