why my code doesn’t return an address from sum function to the main()

Question

#include <stdio.h>
#include <stdlib.h>
int* sum(int* num1,int* num2);
int main(){
  int a = 10000;
  int b=2000;
  int *A = sum(&a, &b);
  return 0;
}
int* sum(int* num1,int* num2){
  int x = (*num1)+(*num2);
  return &x;
      \\(^^)its shows that this line is the only problem. (Core dumped).
}

I am learning about pointers thats why its all pointers. :)