$\"\"$

The inequality is $\"\"$ .

Subtract 4 from each side.

$\"\"$

$\"\"$ .

For any real numbers a and b, where $\"\"$ , if $\"\"$ , then $\"\"$ .

From the inequality $\"\"$ , the value of $\"\"$ .

Therefore the inequality has no solution or $\"\"$ .

The solution set is $\"\"$ and its graph is $\"graph$ $\"\"$

The solution set is $\"\"$ and its graph is $\"graph$