A quadratic equation.
They are something like 4 to the power of 2. It has to be 2. The answer would be 4X4=16.
No, if there is a sqaured variable, the equation is not linear.
An algebraic equation.
An equation for a parabola always has some type of irregular variable, usually a squared variable or higher.
A bivariate equation.
It is a quadratic equation in the one variable.
Basically the fact that some variable is squared - or that one variable is multiplied with another variable.
An open sentence.
that's an equation.