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

Question

5047 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-03-24T12:03:42

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

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

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