Question

Going to need a little help on this concept =)

Answer 1

@MrNood

Answer 2

@triciaal

Answer 3

@mathmale

Answer 4

You are given the vertex of this parabola, so start with the "vertex form of the equation of a parabola:"\[x-h=a(y-k)^2\] for a horiz. parabola.

Know what to do next? Hint: what is the value of h? of k?

Answer 5

Would it be the ordered pair?

Answer 6

You are given the coordinates of the vertex of this parabola, as well as one other point on the parabola. This is all the info you need with which to find the coefficient a. Think about this...what are the coordinates of the vertex, and what are their names? Where will you insert info from the other given point, so that you can finally find "a"?

Answer 7

Well you would subtract

Answer 8

Even if you're unsure of what to do, take the given info and insert it into the "vertex form of the equation of a parabola" that I've given you. I need to see your involvement.

Answer 9

x−h=a(y−k)2
x+3=a(y+1)^2

Answer 10

Is this correct

Answer 11

@mathmale

Answer 12

Ugh please

Answer 13

@welshfella

Answer 14

Try solving this. You have replaced h, k, x and y with numeric values. That leaves only "a" as an unknown. Find a.

Write out the "vertex equation" of this parabola, using your value of "a."

Note that this equation MUST still contain x and y, but not h and k.

Now let y=0 and solve for x. Does your equation correctly predict x?

Answer 15

Ugh I'm still so confused don't you have to compare the vertex to a point 1 unit away from the vertex?

Answer 16

@mathmale @mathmate

Answer 17

the equation in vertex form is

x = a(y + 1)^2 - 3

you need to find the value of a ( ais the coefficient of x^2)

plug in x = 4 and y = 0

4 = a *1^2 - 3

a = ?

Answer 18

OK?

Answer 19

any questions?

Answer 20

do you see why we use x = 4 and y = 0 to find the value of a?

Answer 21

So A=7

Answer 22

yes

Answer 23

Yes, what about the ordered pair do we ignore that

Answer 24

Because you have the given x and y values plugged in, in order to solve

Answer 25

the ordered pair (-3,-1) was the vertex of the graph and that enabled us to write the vertex form of the equation.

Answer 26

Okay, I see

Answer 27

Mathmale has given all the necessary info to solve the problem

Answer 28

Yes, Thank you so much =)

Answer 29

yw

Answer 30

@mathmate since I was working with you before, can I just bother you for a sec

Answer 31

Perhaps you'd like to post a new question.