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

1 Answer
Sep 19, 2016

#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".