# What is the vertex form of #x = (2y +5 )^2 + 21#?

##### 1 Answer

Aug 21, 2017

#### Explanation:

Given:

Note: There is a quick way to do this but it is easy to confuse yourself so I will do it the following way.

Expand the square:

This is the standard form

where

The general vertex form is:

We know that

To find the value of k, use the formula:

To find h, evaluate equation [1] at