y = x^2 -6x + 28
= x^2 - 6x + 9 - 9 + 28 , took half of the 6, squared it, then added and subtracted it
= (x - 3)^2 + 19
so the vertex is .....
Determine the vertex by completing the square. Show process.
y = x^2 -6x + 28
1 answer