# How to solve an equation which is in quadratic form

The title of this post is probably a bit confusing specially the *quadratic form* part of it.

What exactly is an equation of quadratic form anyways? First you need to have a polynomial and your polynomial needs a degree to be >= 2.

For example:

Now how can we solve this equation? We have to use U substitution to get the equation in a form that we can factor.

- Find the U in the equation and define it
- Replace x values in the equation with the u
- Factor the equation
- Solve for U
- Replace U back into the equation
- Solve for X
- Check with the original equation

Example: