Income tax is a direct tax which is levied on the income of private individuals. Various income tax systems exist. Those range from a flat tax to an extensive progressive tax[?] system.
Taxes levied on the income of companies is called corporate tax[?].
... x, both of which are complex numbers. The two solutions are complex conjugates of each other. (In this case, the parabola does not intersect the x-axis at all.)
Note ...