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Determine whether the graph of y = x^2 + 2x − 8 has a maximum or minimum point, then find the maximum or minimum value
 one year ago
 one year ago
Determine whether the graph of y = x^2 + 2x − 8 has a maximum or minimum point, then find the maximum or minimum value
 one year ago
 one year ago

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Spartan_Of_AresBest ResponseYou've already chosen the best response.0
@zaynahf can you please help me?
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
Just a minute, im getting my notes
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
Ok do you know which way the parabola is going? Up or down?
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
i think up because the x^2 is positive
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
yeah it opens up
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
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
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
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.
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
how do i put it in vertex form?
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
I'll give you an example one, if you dont mind
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
dw:1357600335929:dwdw:1357600792411:dw
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
oh that make sense they dont teach that in virtual school
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
I have a link if you want it
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
http://www.youtube.com/watch?v=aDHq_FoRxZQ Explains it better than i did
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
would the vertex be (0.33,10.33)?
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
1,9 if i round?
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
tried the formula by plugging in the numbers
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
wait this ask for the minimum value not the vertex
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
So if thats the vertex, then what would be the minimum?
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
im lost i may have made terrible mistakes
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
Ok, where are you lost from?
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
everything my brain just committed suicied i made mistakes a the beging all the way to the end
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
for finding the vertex?
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
i... thats what i tried but i messed up completely i didnt even simplify right
 one year ago

zaynahfBest ResponseYou've already chosen the best response.1
where did youget up to?
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
i failed at even isolating the x terms( i've been up since 3 am) :(
 one year ago

Spartan_Of_AresBest ResponseYou've already chosen the best response.0
ill be on later i have to go eat dinner
 one year ago
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