Question 238486
1.Opens up, controlled by the sign of {{{x^2}}} coefficient, +up, -down
2.x coordinate of the vertex is {{{x=-b/2a}}}
x=-4/2(1)=-2
y=(-2)^2+4(-2)-45=-49
(-2,-49)
3. Axis of symmetry is the x-position of the vertex, x=-2.
{{{ graph( 300, 300, -10, 10, -50, 10, 2000*x+4100,x^2+4x-45,2000*x+4100) }}}