If the integral ∫0kf(x)dx=0\int_0^k f(x) dx = 0∫0kf(x)dx=0 for f(x)=2x−4f(x) = 2x - 4f(x)=2x−4, what is the value of kkk given that k≠0k \neq 0k=0?
k = 1
k = 2
k = 3
k = 4