If A(-6,7) and B(-1,-5) are the two given points then the . . .

Question : If A(-6,7) and B(-1,-5) are the two given points then the distance 2AB is 

a) 13 

b) 26 

c) 19 

d) 18

Doubt by Saumya

Solution : 

A(-6,7)
B(-1,-5)

By Distance Formula 

AB = √[(x2-x1)2+(y2-y1)2]
AB = √[(-1+6)2+(-5-7)2]
AB = √[(5)2+(-12)2]
AB = √[25+144]
AB = √[169]
AB = 13

So 
2AB = 2×13
2AB = 26

Hence, b) would be the correct option.