Find the distance between the following pairs of points: 
 
 1. \((−5, 7), (−1, 3)\)   
 
Distance between \((−5, 7)\) and \((−1, 3)\) is
 
2. \((a, b), (− a, − b)\) 
 
Distance between \((a,b)\) and \((− a, − b)\) is