If the function f(x)=x^2-k x is monotonically increasing in the interval (1, ) , then which one of the following is correct?

Step-by-step solution

aligned & f(x)=x^2-k x & f^ (x)=2 x-k aligned For monotonically increasing in (1, ) aligned & f^ (x) 0 & 2 x-k 0 & k 2 x, x (1, ) aligned or k 2