title: How to convert manualy hexadecimal to decimal with Two's Complement
body: <p>I cant seem to find answer about how to convert hexadecimal to decimal with Two's Complement example AD100002 i already know how to  do the calculation for unsigned but not for signed 2's complement.
  Any help will do or exampe)
  (thank's for your time)<br>
  (Sorry for bad english).</p>
  
  <p>{unsigned} ->(AD100002 = (10 × 16⁷) + (13 × 16⁶) + (1 × 16⁵) + (0 × 16⁴) + (0 × 16³) + (0 × 16²) + (0 × 16¹) + (2 × 16⁰) = 2903506946).</p>