Obtain the distance between the following pairs of points: 
 
 1. \((−10, 7), (−8, 3)\)   
 
Distance between \((−10, 7)\) and \((−8, 3)\) is
 
2. \((a, b), (− a, − b)\) 
 
Distance between \((a,b)\) and \((− a, − b)\) is