The general idea is illustrated in these threads:
http://www.mathhelpforum.com/math-he...e-problem.html
http://www.mathhelpforum.com/math-he...-x-origin.html
The general idea is illustrated in these threads:
http://www.mathhelpforum.com/math-he...e-problem.html
http://www.mathhelpforum.com/math-he...-x-origin.html
Almost- you have the square root only around the . It should be around the entire expression. You do that by putting the entire expression in { }. But as TheEmptySet said earlier, to minimize , it is sufficient to minimize f(x). So find the x and y that minimize .