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OpenStudy (anonymous):
F(x)=x2+8x+7 (find the vertex. I tried -b/2a but I need an x and y coordinate answer and it only worked for x! How do I find y? I did -b/2a for y too but it wasn't the right answer.):)
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OpenStudy (anonymous):
hi i just answered this question in your previous post. i worked out the details there
OpenStudy (anonymous):
http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4de6e2db4c0e8b0b113bb7d8
OpenStudy (anonymous):
it is the x - value that uses \[-\frac{b}{2a}\]
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