Question

What is the the vertex of `y = (x + 3)^2`?

Answer 1

vertex: `(-3,0)`

Explanation:

`y=(x+3)^2`
could be written as
`color(white)("XXX")y = color(green)(1)(x-(color(red)(-3)))^2+color(blue)(0)`

Which is of the general "vertex form"
`color(white)("XXX")y=color(green)(k)(x-color(red)(a))^2+color(blue)(b)`
with vertex at `(color(red)(a),color(blue)(b))`