# How do you factor #y= 121x^2 - 1#?

##### 2 Answers

This is simply a difference of squares.

Thus

#y = (11x - 1)(11x + 1)#

We can immediately factor it like this because we see that there is no

Hopefully this helps!

See a solution process below:

#### Explanation:

The right side of the equation is a special form of quadratic:

Let

Let

Substituting gives:

We can then write the equation factored as: