Plug the a and b values into the vertex formula to find the x value for the vertex, or the number you’d have to input into the equation to get the highest or lowest possible y. Simplify the formula and solve for x. To do so, i use the leading coefficient of each function to determine whether the graph is opening up or down.
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Here are the steps to find the vertex using this formula
Identify the values of a, b, and c from the quadratic equation