Question

If x co-ordinates of a point P of line joining the points

Q(2, 2, 1) and R(5, 2, –2) is 4, then the z-coordinates of P is

• A. –2
• B. –1
• C. 1
• D. 2

Answer 1

Answer: (B)

–1

Answer 2

AB = $\sqrt{(a–1)^{2} + 3^{2}}$ = 5

̃ a – 1 = ± 4 ̃ a = – 3, 5

CD = $\sqrt{(a–1)^{2} + (a + 5)^{2} + (a - 1)^{2}} = 6$

̃ a² – 2a – 15 = 0

̃ a = – 3, 5