1.

Find the co-ordinates of the points on the x-axis which are at a distance of 10 units from the point (– 4, 8)?

Answer»

Let the co-ordinates of any point on the x-axis be (x, 0). Then distance between (x, 0) and (– 4, 8) is 10 units.

⇒ \(\sqrt{(x+4)^2+(0-8)^2}\) = 10 

⇒ x2 + 8x + 16 + 64 = 100 

⇒ x2 + 8x – 20 = 0 

⇒ (x + 10) (x – 2) = 0 

⇒ x = –10 or 2 

∴ The required points are (– 10, 0) and (2, 0).



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