Question 1037108
You can find a value for the function or functions only for a given or known x value.  Otherwise, you can only find the function subtraction  and the function product, and simplify each.



f-g
{{{2x-4-x^2-3}}}
{{{-x^2+2x-7}}}



f*g
{{{(2x-4)(x^2+3)}}}
{{{2x^3-4x^2+6x-12}}}----or factorize if you want.