SOLUTION: How do you find the turning point (vertex) of a Quadratic function, not using complete the square?

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Question 240648: How do you find the turning point (vertex) of a Quadratic function, not using complete the square?
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
If the equation is y=ax^2 +bx +c, then the vertex is always at the value where x=-b/(2a). After you find x, substitute this back into the original equation (or let the calcluator do it for you!!) to find y.

Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus