# Quadratic Formula and Functions Topics

#### Imaginary and Complex Numbers

It's finally come to this, has it? We've run out of actual numbers to throw at you, so now we're just going to make some numbers up? Not really. Imaginary numbers, despite the name, are totally l...

#### Solving Quadratic Equations

A quadratic equation is a polynomial of degree 2. It always has an x2 term, but no larger exponents. Another way to write that, with more letters but fewer words, is that a quadratic equation has t...

#### Quadratic Functions

So, you already know about functions. They sit there, looking all y = f(x), showing a relationship between the variables x and y. We also have this quadratic equation just sitting here, not doing...

#### Quadratic-Like Equations

Sometimes you'll meet an equation that you think you don't know, and you'll start up a conversation. After a few minutes of talking, though, it finally hits you—this is just like a quadratic eq...

#### Quadratic Inequalities

Remember back when we looked at linear inequalities? At one point, we said, "We promise we'll try to make your brain hurt more later." We always keep our promises, so grab an ice pack and strap...

#### In the Real World

A quadratic equation can be used to describe the arc that a ball travels in the air, with x being the distance it moves and y as its height. You can also relate the ball's height, y, to the amoun...