Posted by Gwendolyn on .
Find the vertex and the axis of symmetry for the parabola with the given equation y=5x230+47....

Algebra 
Reiny,
I will assume you have a typo, with the first term 5x^2 and that the second term is 30x
the x of the vertex = b/(2a) = 30/(10) = 3
sub in x=3
y = 5(9)  30(3) + 47 = 2
vertex (3,2)
axis of symmetry : x = 3 
Algebra 
Gwendolyn,
Thanks, I was getting something like 9
now I see what I did wrong.