Question 103593
there is no {{{x}}} intercept
{{{y}}} intercept is {{{-3.0}}}    (if {{{x=0}}} => {{{y=-3}}})
{{{x1}}} and {{{x2}}} have a real and imaginary part
{{{x2}}}={{{1.5}}} +{{{.866i}}}{{{ i}}}
{{{x2}}}={{{1.5}}} - {{{.866i}}}{{{ i}}}

{{{vertex(h,k)}}}
{{{h=-b/2a}}}
{{{h=-3/2*(-1)}}}
{{{h=3/2=1.5}}}
{{{k= y(h)}}}
{{{k=-1*(3/2)^2 +3(3/2) -3}}}
{{{k=-9/4 +9/2 -3}}}
{{{k=9/4 – 3}}}
{{{k=2.25-3}}}
{{{k=-0.75}}}
vertex {{{1.5}}}, {{{-.75}}} 

table:
y = –x^2 + 3x – 3

x	| y
0	| -3
1	| -1
2	| -1


*[invoke quadratic "x", -1, 3, -3]