Question

which of the following equations is of a parabola with a vertex at (0 -3)

Answer 1

can u help me @LizzyLove<3

Answer 2

do you know the formula for a parabola ?

Answer 3

not really

Answer 4

the most convenient form is the equation of a parabola in vertex form.

Answer 5

Maybe phi has it all under control:) @Shannon20150

Answer 6

idk that form

Answer 7

See
http://www.mathwarehouse.com/geometry/parabola/standard-and-vertex-form.php

for the two forms

Answer 8

If this is multiple choice what are your choices?

Answer 9

But if you look at the site, the vertex form is
y = a(x-h)^2+k

you are told (h,k) is (0,-3)
if we put those numbers in for h and k in the standard form we get
y= a(x-0)^2+ -3 or
y= a x^2 -3

so if you see anything like this as your choice (where a can be any number), that is the answer

Answer 10

Y=(x-3)^2
Y=(x+3)^2
Y=x^2-3
Y=x^2+3
I think that it is the 1st one

Answer 11

maybe you should read by previous post more carefully

Answer 12

if you can't remember all this, you can try this. you know (0 , -3) is on the parabola.
make x =0, and see if any of the choices gives you y= -3
this is not the best way... but it might work in a pinch. (they could give a parabola where 0,-3 is on the parabola, but not the vertex, in which case you are in trouble.

Answer 13

so how would I set it up

Answer 14

@some_someone

Answer 15

what part are you not getting ?

y = a(x-h)^2+k

you are told (h,k) is (0,-3)
if we put those numbers in for h and k in the standard form we get
y= a(x-0)^2+ -3 or
y= a x^2 -3

Answer 16

ohhhhhhhhhh okay

Answer 17

what is the answer ?

(remember a is any number) match
y= a x^2 -3
to your choices