SOLUTION: Select the x-coordinate of the vertex of the parabola defined by the function f(x)=-9x^2+7x+8

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Question 884910: Select the x-coordinate of the vertex of the parabola defined by the function f(x)=-9x^2+7x+8
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39618)   (Show Source): You can put this solution on YOUR website!
Complete the Square to put the function into standard form and then read the x value for vertex from the function.





Although the arithmetic simplifying the constant term is not finished, the x value for the vertex is .

Also study this lesson:
Also shows standard form: Completing the Square to Solve General Quadratic Equation
Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
Select the x-coordinate of the vertex of the parabola defined by the function f(x)=-9x^2+7x+8


x-coordinate of the vertex is: , with: a being - 9, and b being 7

 becomes 

x-coordinate of vertex:  

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