Question

What is the vertex form of `y= x^2 + 4x -21`?

Answer 1

In vertex form ; `y= (x+2)^2-25`

Explanation:

`y=x^2+4x-21 or y = x^2+4x+4-25 or y= (x+2)^2 -25` Here vertex is at (-2,-25) graph{x^2+4x-21 [-80, 80, -40, 40]}[Ans]