If 2^x = 8, then x equals
A1
B2
C4
D3
Answer & Solution
Correct answer: D. 3
1. Express 8 as a power of 2: 8 = 2^3.
2. Equation becomes 2^x = 2^3.
3. Equal bases imply equal exponents: x = 3.
4. The answer is 3.
_Source: ICAI BoS Foundation Paper 3, Ch 1 Unit III 'Indices', p.13_
Related questions
A car uses 4 litres of petrol for 60 km. Its mileage in km per litre is:A man covers a distance in 6 hours at 40 km per hour. To cover it in 4 hours he must traveA man travels equal distances at 40 km per hour and at 60 km per hour. His average speed iA train 200 m long crosses a 100 m platform at 36 km per hour. It takes:A train 150 m long runs at 54 km per hour. The time it takes to pass a pole is:A car covers 300 km at 50 km per hour. At 75 km per hour the same trip would take:Zaheeda doubles her speed on the same route. The time she takes:A journey takes 120 km at a steady 60 km per hour. The time taken is: