# What is the vertex form of #y= 2x^2 + x - 1 #?

##### 1 Answer

#### Explanation:

Vertex form is given by

To get to vertex form, complete the square.

Note: If you want to just find the vertex using

with

If you were to find vertex form using the method previously described, then you would need a point on the graph of

Let's say that they told you

Using the vertex as found out with the formulas above, plug into vertex form with what you have:

To find out

Here is a graph for reference: graph{2x^2+x-1 [-10, 10, -2, 5]}

Hope this helps!