What is a quadratic function?

F (x) = 2x+x+3

F (x) = 0x^2-4x+7

F (x) = 5x^2-4x+5

F (x) 3x^3+2x+2

C - F (x) = 5x^2-4x+5

Quadratic function equations have an x raised to the second power and makes a parabola when graphed. B could potentially also be right depending on who you ask because x is being raised to the second power but since the equation says 0x it means there is no x to be raised to the second power so i would say C.