# What is the the vertex of #y = 3x^2 + 9x+12 #?

##### 1 Answer

Dec 16, 2015

vertex

#### Explanation:

Factor out the

To make the bracketed part a trinomial, substitute

Bring

Recall that the general equation of a quadratic equation written in vertex form is:

#y=a(x-h)^2+k#

where:

So in this case, the vertex is