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NDA2012MathematicsThree Dimensional GeometryActual

If the distance between the point (7,1,-3) and (4,5, ) is 13 units, then what is one of the values of ?

Options

  1. A20
  2. B10
  3. C9
  4. D8

Correct answer

C. 9

Step-by-step solution

aligned & (7-4)^2+(1-5)^2+( +3)^2 =13 & 9+16+ ^2+9+6 =169 aligned aligned & ^2+6 -135=0 & =9,-15 . aligned

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