Question

What is the vertex of `y = 2x^2 + 8x +5`?

Answer 1

The vertex may be gotten several ways, including completing the square: `y = 2(x^2+4x) +5` `= 2(x^2 + 4x + 4) - 8 + 5 =` `2(x+2)^2-3` so a vertex at `(x,y)=(-2,-3)`,