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Find the vertex for f(X)=-x^2+8x+6

My answer is (4,22)Is it correct? If I am correct then what is the line of symmetry?

1 answer

y = ax^2 + bx + c.
axis of symmetry= x = -b/(2a) (basically the x-coordinate)

view the solution to a similar problem step-by-step (by clicking the down green arrow) if you're still struggling with finding the vertex and line of symmetry:

http://hotmath.com/tutor/?pid=genericalg1_10_2_QuadraticEquations_3_905&gt_index=genericalg1:10:2:1