RRB NTPC · Question 19
If x^2 = 25^2 – 15^2, then find the value of x. A. 40 B. 50 C. 20 D. 25
Show answer & explanation
Answer: (C) C
Explanation
x² = 25² − 15² = (25 − 15)(25 + 15) = 10 × 40 = 400, so x = 20.
Railways PYQCBT 1 2016
RRB NTPC · Question 19
Answer: (C) C
x² = 25² − 15² = (25 − 15)(25 + 15) = 10 × 40 = 400, so x = 20.