Question

A parabola has a vertex at (-1, 0) and opens down. What is the equation of the parabola?

is it y = -(x - 1)^2?

Answer 1

remember the formula from the last one that someone else did with you?
(x minus k) ….

Answer 2

From this the last two problems you have all you'll ever need to do these. You just have to think about it for a while.

Answer 3

this and the last two

Answer 4

y = -(x + 1)^2?

Answer 5

Yes. Except there could be a factor a
y = -a(x+1)^2