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Mathematics
OpenStudy (anonymous):

-x^2-x+1 find the vertex

OpenStudy (anonymous):

This is pretty similar to other question you asked http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4df8ec790b8b370c28bdd631

OpenStudy (anonymous):

magic formula for vertex is \[-\frac{b}{2a}\]

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