# How do you write #y=-x^2+20x-80# in vertex form?

##### 2 Answers

#### Explanation:

The vertex form of a quadratic equation is :

The quadratic form is performed by factorization.

To complete the square of the above equation we recognize that the second term should be

Therefore,

#### Explanation:

To write a quadratic trinomial in vertex from you need to change:

In

This is now vertex form, giving the vertex as