$\"\"$

The value is $\"\"$ .

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

So $\"\"$

$\"\"$ (The product of two same sign is positive) $\"\"$

If a is negative then $\"\"$

Therefore $\"\"$

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

$\"\"$ (Negative times a negative equals a positive) $\"\"$

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