This is not classified as a word problem and should not be submitted as such. You can find the vertex of the parabola by graphing, which involves converting the equation into its standard form. You should substitute "f(x)" with "y" and then enter the equation "y=-7x^2 + 9x + 3" into our web solver or our desktop software to graph the equation.

Our desktop software has a wizard specific to parabolic equations, one designed solely for calculating the vertex point. Our web solver is located at doyourmath.com and a free trial version of our desktop software is available through these links:

Windows: https://www.softmath.com/tr/alg51win-tr-en.exe

Mac: https://www.softmath.com/tr/alg51mac-tr-en.dmg