2009 · Q64
The length of a line segement AB is 2 unit. It is divided into two parts at the point C such that AC 2 = AB × CB. What is the length of CB?
Elementary MathematicsAlgebra
- A3 + √5 unit
- B3 – √5 unit
- C2 – √5 unit
- D√3 unit
Explanation
(2−x)² = 2x gives CB = 3 − √5.