Step 1:

The expression is .

Adding each side by .

The above expression is a quadratic inequality expression.

Rewrite the expression is, .

factor out .

Here, there are two ways that this product could be greater than zero (positive) - both factors are positive or both factors are negative.

Case 1: Both factors are positive.

The only condition that makes both true is.

Case 2: Both factors are negative.

The only condition that makes both true at .

The solution of in interval .

Solution :

The solution set is .