Solving an equation means determining your **truth set**. In solving an incomplete equation, we use factorization techniques and two important properties of real numbers:

**1st Property: **

** 2nd Property: **

**Case 1:** type equation .

Example:

- Determine the roots of the equation , being .
**Solution**Initially we put*x*in evidence:

For the product to be zero, one of the factors alone must be. Like this:

In this way we obtain two roots that form the truth set:

In general, the equation of type have for solutions and .

**2nd Case:** type equation

Examples:

Determine the roots of the equation , being

*U*=**GO**.**Solution**:

In general, the equation of type has two real roots if is a positive number and has no real root if be a negative number.