- 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)

- jamiebookeater

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- 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

i am stuck between A and B

- iwanttogotostanford

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## More answers

- iwanttogotostanford

- iwanttogotostanford

- zzr0ck3r

Do you not understand something I wrote?

- iwanttogotostanford

NO i am just stuck between answer A and B

- zzr0ck3r

Show me your work. i.e. show me your vertex form.

- iwanttogotostanford

i just want to know if i got it right and i am stuck between A and B!

- 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

that is not what we are here for.

- zzr0ck3r

@hero must be on his phone, that took way to long and your just repeating :P

- Hero

Yeah, I don't have the best tools right now.

- iwanttogotostanford

s o it is A?

- Hero

.Not tellin

- iwanttogotostanford

i did the work but I'm just stuck between minimum and maximum which is A or B! p

- Hero

We've given you enough info.

- iwanttogotostanford

i don't know yet.

- iwanttogotostanford

how do i tell between minimum and maximum

- Hero

Read What I wrote about quadratic functions once more.

- iwanttogotostanford

i did i still don't know A or B

- iwanttogotostanford

- Hero

This is similar to what happens when you give someone money, but they don't Know how to spend it.

- iwanttogotostanford

who wouldn't know how to spend money

- iwanttogotostanford

@mathway please help

- anonymous

Have you found the vertex form?

- iwanttogotostanford

well kind of, i am just stuck between a and B

- anonymous

Can you show me the steps you did?

- iwanttogotostanford

i have it all written on paper i can't take a picture..

- anonymous

You can select the Draw button to write your work.

- iwanttogotostanford

well for my last step i Got A!! finally figured how to do it:-)

- anonymous

So you will not show your work then? Okay.

- iwanttogotostanford

no, i got the answer- thanks anyways though! @mathway

- anonymous

All right, but I won't say if you're right or wrong.

- iwanttogotostanford

ok

- iwanttogotostanford

i know I'm right so thank you though

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