1. The point lies in the octant X’OY’Z’.
2. Direction ratios of the line joining (-1, -2, -3) and (3, 4, 5) are (3 + 1), (4 + 2), (5 + 3) ⇒ 4, 6, 8 ⇒ 2, 3, 4.
Therefore direction cosines are
3. Given, OP = \(\sqrt{50}\)
Therefore the point is (3, 4, 5).