Answer:
Any function is quadratic whose highest degree is 2, it means we should have x² or y² as the only highest degree term.
Note:- We do not consider x³ or y³ because it will make cubic equations.
So from the given options, we can select followings:-
x = 3y² -6y +5
y +3 = -2x² +5
y = 2x² -8x +6
y = 5·x·(x + 9) -8 = 5x² +45x -8
y - 2x² = 3x -2x² +4
Explanation: