# How do you write the Vertex form equation of the parabola #y=x^2-1 #?

##### 1 Answer

May 19, 2017

#### Explanation:

The Vertex form is derived by the process called 'completing the square'.

Assumption: You do not need a step by step explanation.

If you do then see the example: https://socratic.org/s/aEP7wZdu

Using a place holder write as:

Thus we have:

Thus the vertex is at

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This is as expected because we have lowered by 1 the standard graph of