If x + 1/x = 5, then x² + 1/x² = ?
23
The answer
(x+1/x)² = x²+2+1/x². So x²+1/x² = 25-2 = 23.
Source: Verified
- aptitude
More from Aptitude
- If a train travels 360 km in 4 hours, what is its speed?
- What is 15% of 200?
- A shopkeeper sells at 20% profit. If cost price is 500, what is selling price?
- If A can do a job in 10 days and B in 15 days, together they finish in?
- What comes next: 2, 6, 12, 20, 30, ?
- Simple interest on Rs 5000 at 8% for 2 years?