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Railways PYQCBT 2 2017

RRB NTPC · Question 87

Simplify: (3y)^2 + x^2 - (2y)^2

  1. x^2 - 5y^2

  2. x^2 + y^2

  3. x^2 - y^2

  4. x^2 + 5y^2

Show answer & explanation

Answer: (D) x^2 + 5y^2

Explanation

(3y)² + x² − (2y)² = 9y² + x² − 4y² = x² + 5y².