Question 639284
a = -2, b = -16, c = -33
{{{-b/2a = -(-16)/(2(-2)) = -4}}}
{{{(4ac - b^2)/(4a) = (4(-2)(-33) - (-16)^2)/(4(-2)) = -1}}}
Vertex is (-4,-1).
The graph opens downward because a<0, therefore it has a maximum value when x = -4. The maximum value is -1.
*[invoke quadratic "x", -2, -16, -33 ]