Andy completes the square for the equation x2 + 6x - 8 = 0. which of the following equations reveals the vertex of the parabola? will fan and medal

If the equation  has undergo completing the square, the answer would be:


**In this example, since 6x is the middle term, what comes to my mind is the polynomial (x+3) because 2ab results into 6x. [from the special products lesson ] 

So if the equation is equal to y, then this equation's

The vertex would be on the point (-3, -17)