Compute in symbolic math toolbox the result of function f(x) for x equals another symbolic expression

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Giorgos Papakonstantinou
I have two functions defined with symbolic toolbox such as:
f(x)=a*x;
g(x)=b*x^2;
I want to set to x another symbolic expression.
which is:
x=k+1;
and the then find the difference:
g(k+1)-x(k+1)
Do you know how I do it?

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采纳的回答

Giorgos Papakonstantinou
Ok I found it.
dif=subs(g,x,k+1)-subs(f,x,k+1);

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