iwanttogotostanford
  • iwanttogotostanford
HEY NEED HELP ASAP PLEASE: Using the completing-the-square method, find the vertex of the function f(x) = –2x^2 + 12x + 5 and indicate whether it is a minimum or a maximum and at what point. Maximum at (–3, 5) Minimum at (–3, 5) Maximum at (3, 23) Minimum at (3, 23)
Mathematics
jamiebookeater
  • jamiebookeater
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zzr0ck3r
  • zzr0ck3r
\(f(x)=ax^2+bx+c\\f(x)=a(x+\frac{b}{2a})^2+c-\frac{b^2}{4a}\) Has vertex \((-\frac{b}{2a}, c-\frac{b^2}{4a})\) This is a maximum if \(a<0\) and a minimum if \(a>0\)
iwanttogotostanford
  • iwanttogotostanford
i am stuck between A and B
iwanttogotostanford
  • iwanttogotostanford

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iwanttogotostanford
  • iwanttogotostanford
iwanttogotostanford
  • iwanttogotostanford
zzr0ck3r
  • zzr0ck3r
Do you not understand something I wrote?
iwanttogotostanford
  • iwanttogotostanford
NO i am just stuck between answer A and B
zzr0ck3r
  • zzr0ck3r
Show me your work. i.e. show me your vertex form.
iwanttogotostanford
  • iwanttogotostanford
i just want to know if i got it right and i am stuck between A and B!
Hero
  • Hero
For quadratic functions with the form f(x) = ax^2 +bx+c , if a is negative, then the function will have a maximum value at the vertex.
zzr0ck3r
  • zzr0ck3r
that is not what we are here for.
zzr0ck3r
  • zzr0ck3r
@hero must be on his phone, that took way to long and your just repeating :P
Hero
  • Hero
Yeah, I don't have the best tools right now.
iwanttogotostanford
  • iwanttogotostanford
s o it is A?
Hero
  • Hero
.Not tellin
iwanttogotostanford
  • iwanttogotostanford
i did the work but I'm just stuck between minimum and maximum which is A or B! p
Hero
  • Hero
We've given you enough info.
iwanttogotostanford
  • iwanttogotostanford
i don't know yet.
iwanttogotostanford
  • iwanttogotostanford
how do i tell between minimum and maximum
Hero
  • Hero
Read What I wrote about quadratic functions once more.
iwanttogotostanford
  • iwanttogotostanford
i did i still don't know A or B
iwanttogotostanford
  • iwanttogotostanford
Hero
  • Hero
This is similar to what happens when you give someone money, but they don't Know how to spend it.
iwanttogotostanford
  • iwanttogotostanford
who wouldn't know how to spend money
iwanttogotostanford
  • iwanttogotostanford
@mathway please help
anonymous
  • anonymous
Have you found the vertex form?
iwanttogotostanford
  • iwanttogotostanford
well kind of, i am just stuck between a and B
anonymous
  • anonymous
Can you show me the steps you did?
iwanttogotostanford
  • iwanttogotostanford
i have it all written on paper i can't take a picture..
anonymous
  • anonymous
You can select the Draw button to write your work.
iwanttogotostanford
  • iwanttogotostanford
well for my last step i Got A!! finally figured how to do it:-)
anonymous
  • anonymous
So you will not show your work then? Okay.
iwanttogotostanford
  • iwanttogotostanford
no, i got the answer- thanks anyways though! @mathway
anonymous
  • anonymous
All right, but I won't say if you're right or wrong.
iwanttogotostanford
  • iwanttogotostanford
ok
iwanttogotostanford
  • iwanttogotostanford
i know I'm right so thank you though

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