# How do you solve using the completing the square method #x^2 + 2x - 15 = 0#?

##### 2 Answers

The solutions are:

#### Explanation:

To write the Left Hand Side as a Perfect Square, we add 1 to both sides:

Using the Identity

#### Explanation:

The equation in standard form is:

The equation in vertex form is:

They are different versions of the same thing!

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Set the vertex form equation as equal to zero

Taking the square root of both sides

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Multiply both sides by (-1)

'....................................................................

'...................................................