Question

What is the value of x? A/ 2 units B/ 3 units C/ 5 units D/ 8 units

Answer 1

C. x=5 units.

Explanation:

In right triangle ABC, the height BD is the geometric mean of the segments AD and DC.

Hence,

`BD^2=AD\cdot DC,\\ \\10^2=x\cdot 4x,\\ \\100=4x^2,\\ \\x^2=25,\\ \\x=5\ un.`