Организовать вычисления по формуле

format PE console
entry start
 
include 'D:\fasmw16726\INCLUDE\win32a.inc'
 
section '.data' data readable writeable
message db '%d',0
a1 db 1
a2 db 1
a3 db 1
a4 db 1
x db 1
res dw 0
section '.code' code readable executable
;H=a1+a2*x+a3*x2+a4*x3
start:
  xor eax,eax
  mov al,[a2]
  mul [x]
 
  xor ebx,ebx
  mov bl,[a3]
  mul [x]
 
  xor ecx,ecx
  mov cl,[a2]
  mul [x]
  add ax,bx
  add ax,cx
  add al,[a1]
  mov [res],ax
 
  cinvoke printf,message,dword [res]
  cinvoke getch
  invoke ExitProcess,0
section '.idata' import data readable
library kernel,'kernel32.dll',\
        msvcrt,'msvcrt.dll'
 
import kernel,\
       ExitProcess,'ExitProcess'
 
import msvcrt,\
       setlocale,'setlocale',\
       printf,'printf',\
       getch,'_getch'

mov al,[a4]
mul [x]
add al,[a3]
mul [x]
add al,[a2]
mul [x]
add al,[a1]
adc ah,0
mov [res],ax