$\"\"$

The value is $\"\"$ .

If a is any number, then the opposite of a is –a.

So $\"\"$

$\"\"$ (Product of two different signs is negative) \ \ $\"\"$

If a is positive then $\"\"$

Therefore $\"\"$

$\"\"$ (Absolute value $\"\"$ ) $\"\"$

$\"\"$ and $\"\"$ .