Railway Recruitment Board Mathematics — Question 1729
Question
What is the value of x² − y² when x = 8 and y = 3?
- 50
- 64
- 55
- 73
Correct answer
C — 55
Explanation (English)
x² − y² = (x + y)(x − y) = (8 + 3)(8 − 3) = 11 × 5 = 55.
More Mathematics questions
- Time and Distance — A train running at 60 km/h crosses a 200m platform in 30s. Find length of train.
- Percentage — If 20% of a number is 50, what is 40% of that number?
- Average — Find the average of 12, 18, 24, 30, 36
- Profit and Loss — A shopkeeper sells an item at 20% profit. If CP is ₹500, find SP.
- Simple and Compound Interest — What is the compound interest on ₹10000 at 10% per annum for 2 years?
- Ratio and Proportion — If the ratio of two numbers is 3:5 and their sum is 80, find the larger number.
Practice 1000+ more questions like this
TestPod AI has hand-curated previous-year-questions for SSC, RRB NTPC, IBPS PO, SBI Clerk, and more — with AI explanations in Tanglish, Hinglish, and English.