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Use simplify_full:

sage: f(x) = sum(k,k,0,x) sage: f x |--> 1/2x^2 + 1/2x sage: f(x) = sum(binomial(10,k),k, 0,x) sage: f x |--> sum(binomial(10, k), k, 0, x) sage: f(2) sum(binomial(10, k), k, 0, 2) sage: f(2).simplify_full() 56

Use simplify_full:

sage: f(x) = sum(k,k,0,x) sage: f x |--> 1/2x^2 1/2*x^2 + 1/2x 1/2*x sage: f(x) = sum(binomial(10,k),k, 0,x) sage: f x |--> sum(binomial(10, k), k, 0, x) sage: f(2) sum(binomial(10, k), k, 0, 2) sage: f(2).simplify_full() 5656