Let f be the function defined by f(x)=ax^2+bx+2/2x^2−8, where a and b are constants. The ... Let f be the function defined by f(x)=ax^2+bx+2/2x^2−8, where a and b are constants. The graph of f has a horizontal asymptote at y=3, and f has a removable discontinuity at x=2
. b) At what value of x does f have a discontinuity due to a vertical asymptote? Give a reason for your answer.