# How do you factor #y= x^4 + 5x^2 - 6# ?

##### 2 Answers

#### Explanation:

Given

We notice that all terms containing the variable

so to simplify things initially we will replace

which can easily be factored as:

Restoring

The first factor,

but the second,

giving

#### Explanation:

Perhaps it will help if I rewrite this expression for

Let

This is something we can factor pretty easily.

Just substitute back to get

And now, the last step is to factor the second bit which is a difference of two squares: