Question

Create an equation. Use the graph below to create the equation of the rainbow parabola.

Answer 1

it's an upside down parabola

Answer 2

http://assets.openstudy.com/updates/attachments/556f231ce4b0c4e453fa9e42-rosebud4612flvs-1433346859795-1.gif

Answer 3

@Loser66 @Luigi0210

Answer 4

what is the vertex-form of a parabola?

Answer 5

um... (h,k) is the vertex

Answer 6

y=a(x-h)^2-k @Loser66 ??

Answer 7

yes, but +k, not -k and your vertex is ???

Answer 8

(0,36)

Answer 9

ok, so, it is ?? y = ??

Answer 10

replace h, k in

Answer 11

um...y=x^2+36?

Answer 12

where is your a??

Answer 13

y =a x^2 +36 , ok??

Answer 14

kk!

Answer 15

Now, pick a point on the graph. (either of them, not vertex)

Answer 16

um -6?

Answer 17

a point means (.., ...) not just -6

Answer 18

(0,6)

Answer 19

you don't have that point!! , you have (-6,0) or (6,0)

Answer 20

which one do you choose??

Answer 21

whoops! um...(6,0) :)

Answer 22

ok, that is x =6 , y =0 right?
plug that point into y = ax^2 +36, what do you have?

Answer 23

an upside down parabola / like a rainbow means the value of a is negative

Answer 24

y=-x^2+36

Answer 25

@triciaal please, be patient, it will be there!!