A function is called quadratic function if the highest degree of polynomial having single variable is 2.
For example : x², x²+x, x²+3, x²+x+3,
Or General form of Quadratic function = a x² + b x + c
The graph of quadratic function is in the shape of Parabola .It cuts the X axis in two points.
Either both the roots of Quadratic function is Real or both are Imaginary.
Among all the options : Option(3) which is c(x)= -8 x²...3 x -5 is Quadratic.
.......= either +ve sign or -ve sign.
