Question

What is the standard form of `y= (x + 2)(x – 2)`?

Answer 1

`y=x^2-4`

Explanation:

`y=(x+2)(x-2)`

Distribute (FOIL)
`y=x^2-2x+2x-4`

Combine like terms
`y=x^2-4`

This is typically what's called standard form.

It is also can be written as
`y=(x-0)^2 -4`.
This is usually called "vertex form" with the vertex at `(0,-4)` but some textbooks refer to it as "standard form".