Question 470820
{{{9x^2+8y^2-5x+8y-23=0}}}
In the general second-degree equation {{{Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0}}} the discriminant {{{B^2-4AC}}}
{{{B=0}}}, {{{A=9}}}, {{{C=8}}}
the discriminant {{{B^2-4AC=0^2-4*9*8=-288<0}}} if {{{B^2-4AC<0}}}, the equation represents an ellipse
Answer: c. Ellipse