anonymous
  • anonymous
Determine whether the graph of y = x^2 + 2x − 8 has a maximum or minimum point, then find the maximum or minimum value
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@zaynahf can you please help me?
anonymous
  • anonymous
Just a minute, im getting my notes
anonymous
  • anonymous
Ok do you know which way the parabola is going? Up or down?

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anonymous
  • anonymous
i think up because the x^2 is positive
anonymous
  • anonymous
yeah it opens up
anonymous
  • anonymous
Right! So based on that, it tells you whether your vertex will have a maximum or minimum value. When it is opening up (a value is +), there will be a minimum because the vertex is on the bottom, the lowest point of the parabola. When it is opening down (a value is -), there will be a maximum value because the vertex is at the top, the highest point of the parabola. When naming the min/max, you only use the y value of the vertex. Example:|dw:1357599979562:dw|
anonymous
  • anonymous
One more thing: IF you know how to find a vertex when it is in standard form, you can do that, but personally i find it easier to first complete the square (make it into vertex form). If you need to know how to do either, let me know.
anonymous
  • anonymous
how do i put it in vertex form?
anonymous
  • anonymous
I'll give you an example one, if you dont mind
anonymous
  • anonymous
anonymous
  • anonymous
|dw:1357600335929:dw||dw:1357600792411:dw|
anonymous
  • anonymous
oh that make sense they dont teach that in virtual school
anonymous
  • anonymous
I have a link if you want it
anonymous
  • anonymous
OK
anonymous
  • anonymous
http://www.youtube.com/watch?v=aDHq_FoRxZQ Explains it better than i did
anonymous
  • anonymous
would the vertex be (-0.33,-10.33)?
anonymous
  • anonymous
No o.o
anonymous
  • anonymous
How did you get that?
anonymous
  • anonymous
-1,-9 if i round?
anonymous
  • anonymous
tried the formula by plugging in the numbers
anonymous
  • anonymous
Yep, its -1,-9
anonymous
  • anonymous
wait this ask for the minimum value not the vertex
anonymous
  • anonymous
So if thats the vertex, then what would be the minimum?
anonymous
  • anonymous
im lost i may have made terrible mistakes
anonymous
  • anonymous
Ok, where are you lost from?
anonymous
  • anonymous
everything my brain just committed suicied i made mistakes a the beging all the way to the end
anonymous
  • anonymous
for finding the vertex?
anonymous
  • anonymous
i... thats what i tried but i messed up completely i didnt even simplify right
anonymous
  • anonymous
where did youget up to?
anonymous
  • anonymous
i failed at even isolating the x terms( i've been up since 3 am) :-(
anonymous
  • anonymous
Isolate: (x^2 +2x )-8
anonymous
  • anonymous
ill be on later i have to go eat dinner
anonymous
  • anonymous
ok

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