I determined the likelihood(theta)=L(theta)=(2*theta+1)^-n

Then the log-likelihood to be -n*(2*theta+1), finding the first derivative and setting to 0 to maximize is ineffective. Examining the likelihood function, X_(n), the MAX(X_1,…,X_n) should maximize the likelihood function.

Professor says I am wrong in developing my likelihood function. Can anybody help?

Thanks in advance.