Question 267384
Factoring the original equation, we get
 (x-2)*(x-2)
However, that can be expressed as
(x-2)^2
SInce there is no number after the squared binomial, the vertex form of this is
y = (x-2)^2 + 0
The vertex is "opposite of the inside number, outside number"
so the vertex is (2,0)
The vertex shows us a minimum
Here is the graph
{{{ graph( 300, 200, -5, 5, -10, 10, (x-2)^2) }}}