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OpenStudy (anonymous):
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OpenStudy (anonymous):
@pizzapi
OpenStudy (anonymous):
@coolaidd Do you want to give it a try?
OpenStudy (noelgreco):
Since you know where the vertex is, and you also know there are two zeros, you know the concavity, and can eliminate two answers. The x-coordinate of the vertex is given by -b/2a. Elimination works.
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