**Solving Equations by Factoring**

** **

**Zero-Factor Property**

If two numbers have a product of 0, then at least one of the numbers

must be 0. That is, if ** ab **=

**0,**then either

**=**

*a***0**or

**=**

*b***0.**

** **

**Quadratic Equation**

** **

An equation that can be written in the form

*ax*^{2 }**+ ** ** bx **+

**=**

*c***0,**

where *a *≠ 0, is a **quadratic equation. **This form is called **standard form.**