by Guest » Sun Nov 25, 2018 2:10 pm
This is not a quadratic equation and a quadratic function
[tex]y = \frac{1}{5}x^2 - \frac{2}{5}[/tex]
Quadratic equations are in the form of
[tex]ax^2+bx+c = 0[/tex]
where a, b and c are numbers.
We have no second variable.