Question

How do you write `y=x^2+4x-1` in vertex form?

Answer 1

In this way:

`y=x^2+4x-1rArry=x^2+4x+4-4-1rArr`

`y=(x+2)^2-5rArry+5=(x+2)^2`.

The vertex is `V(-2,-5)`.