Factorials of negative integers are generally undefined in standard mathematics because the defining formula n!=n× (n-1)! leads to a division by zero (e.g., (-1)!=0!÷0. While the Gamma function, Gamma (n+1)=n!, extends factorials to complex numbers, it becomes infinite at negative integers. Some contexts, however, may define them using extended formulas, such as (-n)!=(-1)^{n}n!

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Absolute of a negative is a positive 😊👍
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The absolute value | x | of a real number x is the non-negative value of x without regard to its sign. For example, the absolute value of 5 is 5, and the absolute value of −5 is also 5. The absolute value of a number may be thought of as its distance from zero along real number line.

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In simple terms, the absolute value of a negative number is a positive number. Just take note 🫱🏽‍🫲🏾
With that ;
| 1| = 1
| -2 | = 2

1 + 2 = 3✅
> Nana✌🏾
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Root of 10,000 is 100👍😄

Exactly 💯