MATLAB: The matlab does not recognize the function sym. how can I solve this problem

Question

my matlab does not recognize the function sym:

sym x; f=3*x

??? Undefined function or method 'sym' for input arguments of type 'char'.

Error in ==> Untitled at 1 sym x;

how can I solve this problem?

Answer 1

you need to purchase the Symbolic Math Toolbox.

You probably don't have it.

check

syms x;