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`y^2+z^2+6y+8z+25=0``y^2-z^2+6y+8z-25=0``y^2+z^2-6y-8z+25=0``y^2+z^2-6y-8z-25=0`

Answer :

C**Introduction**

**Physical meaning of a point and Co-ordinates of a point in space.**

**Distance formula + Derivation**

**What is Section formula And internal / external division formula**

**Find the coordinates of a point which divides the line segments joining the points `(1;-2;3) & (3;4;-5)` in the ratio `2:3` internally and externally**