<PRE><B>Question 320535</B>
y = -x^2 + 6x


you found the axis of symmetry OK (x = -b / 2a)


substituting back into the function ___ y = -(3^2) + 6(3) = -9 + 18 = 9


not sure where the x^2 coefficient of 2 comes from in your substitution?</PRE>