Question 760085: How do I find the missing A value in a quadratic equation?
Answer by KMST(5328)   (Show Source):
You can put this solution on YOUR website! I'm hoping this answers your question.
 is one of infinite equivalent equations, and you may not need to find  .
If you know that the solutions of a quadratic equation are  and  , you can conclude that one of the equivalent equations with those solutions is
 which can also be written as 
If you multiply both sides of the equal sign times a non-zero number, you get an equivalent equation, such as
 if you multiply times  , or
 if you multiply times a number such that  .
On the other hand, If you are looking for a quadratic function
 , you need at least 3 (x,y) points (or equivalent information) to find ,  , and  .
The coordinates of the vertex and one other point would do too.
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