A random variable has a density function given by fx 1betan

A random variable has a density function given by f(x) = 1/beta^n x^infinity - 1 e^-x/beta.it is know E(X) = alphabeta,V(x) = alphabeta^2.Let x = sigma 1=1 to n and y rightarrow = sigma i=1 to n x^2i/n For a random sample X\\ , . . . , xn what is the partial derivative of the log-likelihood function with respect to beta ? analphabeta + sigma i=1 to n (xi/beta)