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How to find the distance between these two points a(5,7) and b(1/13,-5/13)?

ive tried so many times but cant get it right! please help! the answer should be square root of 1024/13 but i cant get it!!!

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Find the distance between
a(5, 7) and b(1/13, -5/13).
Distance = sqrt[(X - x)^2 + (Y - y)^2]
D = sqrt[(5-1/13)^2 + (7--5/13)^2]
=. sqrt[(4 12/13)^2 + (7 5/13)^2]
=. sqrt[(64/13)^2 + (96/13)^2]
=. sqrt [4096/169 + 9216/169]
=. sqrt(13,312/169)
= 115.38/13.
=. 8.88 about. ANSWER

Helpful Fun Thanks for voting Comments (2)
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Thats the same answer i was getting, but thts not the same answer thats in my book...
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Books can be wrong.
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