# Pre-Calculus

### How to Factor a Polynomial Expression

In mathematics, factorization or factori...

### How to Find the Cosine of a Doubled Angle

You can use three different formulas to...

### 1,001 Pre-Calculus Practice Problems For Dummies C

Pre-calculus draws from algebra, geometry, and trigonometry and combines these topics to p...

### How to Decompose Partial Fractions

A process called partial fractions takes...

### How to Solve Linear Systems

When you solve systems with two variable...

### How to Solve Systems that Have More than Two Equat

Larger systems of linear equations invol...

### Rules for Adding and Subtracting Matrices

To add or subtract matrices, you have to operate on their corresponding elements. In other...

### Finding the Key Parts of All Hyperbolas

A hyperbola is the set of all points in the plane such that the difference of the distance...

### Completing the Square for Conic Sections

When the equation of a conic section isn’t written in its standard form, completing...

### Basics of How to Guess and Check Real Roots

You can use the rational root theorem to narrow down the search for roots of polynomials....