cancertism cancertism

23-02-2018
Mathematics

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Find the distance between the points (–1, –2) and (8, 4)
A. 3 times the square root of 5
B. 3 times the square root of 13
C. The square root of 30
D. 13 times the square root of 3

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sqdancefan sqdancefan

24-02-2018

By the Pythagorean theorem
.. d = √((8 -(-1))^2 +(4 -(-2))^2) = √117
.. d = √(9*13) = (√9)*(√13)
.. d = 3√13

Selection B is appropriate.

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