anonymous
  • anonymous
Help, will fan and medal. need someone to teach me please!
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
What is the equation of the following graph?
anonymous
  • anonymous
@LynFran can you help me with this? please
anonymous
  • anonymous
@Robert136 can you help?

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
you know the vertex so that makes it easier
anonymous
  • anonymous
i dont know the vertex...i dont get these at all.
anonymous
  • anonymous
owait do you need the quadractic or both the quadratic and the dotted line...
anonymous
  • anonymous
idk..its something to do with ellipses, parabola, or hyperbola...that what the section was about
anonymous
  • anonymous
i can help with the parabola, not sure about that line though
Loser66
  • Loser66
What is the directrix? y=??
Loser66
  • Loser66
What is the vertex? You need both them to write out the equation. Please, answer.
anonymous
  • anonymous
the vertex is (1,4)
anonymous
  • anonymous
whats the directrix.... i dont think ive learned those
Loser66
  • Loser66
The red line below to the graph is a directrix
Loser66
  • Loser66
if you don't know that method, ok, pick 3 points on the graph. Please.
anonymous
  • anonymous
y = 3
anonymous
  • anonymous
thats the directrix
Loser66
  • Loser66
Now, what method do you want me to follow?? directrix method or standard one?
anonymous
  • anonymous
which one do u think would be the easiest to understand?
Loser66
  • Loser66
Depend on you. I am ok with both
Loser66
  • Loser66
Standard one, ok?
anonymous
  • anonymous
okay
Loser66
  • Loser66
what is the standard form of a parabola?
anonymous
  • anonymous
y=ax^2+bx+c
Loser66
  • Loser66
YYYYYYYYYYYYYES
Loser66
  • Loser66
now, 3 points Vertex (1,4) you pick other two.
anonymous
  • anonymous
just 2 random points?
Loser66
  • Loser66
Yes, but for convenience, you should pick the point whose coordinates are integers like (-1,5). Got what I meant?
anonymous
  • anonymous
so the points where the red line cross over?
Loser66
  • Loser66
no, the point on the parabola
anonymous
  • anonymous
like (3,5)
Loser66
  • Loser66
Yes,
Loser66
  • Loser66
Now, starting Vertex \((\color{red}{1}, \color{blue}{4})\) Plug them into the standard form like \(\color{blue}{4}= a\color{red}{1^2}+b\color{red}{1}+c\) you have 4 = a +b +c, right? name it as (*) Do the same with other two point, what do you get?
anonymous
  • anonymous
im lost.. im sory. my computer froze sorry about the late anwser
anonymous
  • anonymous
@Loser66 ?
anonymous
  • anonymous
5=a-b+c 5=5a+5b+c
anonymous
  • anonymous
@Loser66 am I understanding it?
anonymous
  • anonymous
@Mehek14
Loser66
  • Loser66
5=a -b +c, yes but for (3,5) it is not right 5 = a(3^2) +b(3) +c , that is 5= 9a +3b+c
Loser66
  • Loser66
Now, you have 3 equations, 3 unknowns a, b, c. You can solve for them a + b + c = 4 (*) a - b + c = 5 (**) 9a + 3b + c = 5 (***)
Loser66
  • Loser66
Take (*) -(**) , what do you get?
anonymous
  • anonymous
-1
anonymous
  • anonymous
@Loser66
anonymous
  • anonymous
so i have -1 left, and 9a + 3b + c = 5
Loser66
  • Loser66
|dw:1439603548746:dw|
Loser66
  • Loser66
Take (***) -(**)
anonymous
  • anonymous
8a + 4b
Loser66
  • Loser66
|dw:1439603653405:dw|
Loser66
  • Loser66
Replace a = 1/4, b = -1/2 in (*) you get c = ??
anonymous
  • anonymous
c=4.25
Loser66
  • Loser66
yes, or 17/4 Now, plug back to standard form, y = ax^2 +bx+c . that is your answer.
anonymous
  • anonymous
y=ax^2+bc+17/4?
Loser66
  • Loser66
a = 1/4 b= -1/2 c = 17/4 Plug in \(y= ax^2+bx +c\)
anonymous
  • anonymous
okay thank you. can i tag u if i have anymore questions? i like tht ur showing me instad of telling me
misty1212
  • misty1212
HI!!
misty1212
  • misty1212
there might be a somewhat easier way to get this, using two points although above method certainly works
anonymous
  • anonymous
thank you. im sure ill run into more of these, do u mind if i tag u if i need help?

Looking for something else?

Not the answer you are looking for? Search for more explanations.