User Portlet User Portlet

Discussions
I want to solve this: " y= sqrt { { a }^{ 2 }+{ x }^{ 2 } } + sqrt { { (b-x) }^{ 2 }+{ c }^{ 2 } } minimize this expression. a, b, c are constants." But I want to use a, b and c as constants. How I can compute it here?