Q15Short answer
Prove that the function f defined by x , x≠0 f ( x) = x + 2 x k x=0 , remains discontinuous at x = 0, regardless the choice of k.
Prove that the function f defined by x , x≠0 f ( x) = x + 2 x k x=0 , remains discontinuous at x = 0, regardless the choice of k.