Question

Witch equation is y=9x^2-1 rewrites in vertex form?

Answer 1

The vertex form will be:
`y=9(x-0)^2 -1`

Step-by-step explanation

The vertex form of any quadratic is :
`y= a(x-h)^2 +k` where
`(h,k)` is the vertex point.

Given equation is :
`y= 9x^2 -1`

`x^2` can be rewritten as
`(x)^2` or
`(x-0)^2`

Thus,

`y=9x^2-1\\\\ y=9(x-0)^2 -1`

This equation is in form of
`y= a(x-h)^2 +k`

So, the vertex form will be:
`y=9(x-0)^2 -1`