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SSC CHSL 2023 · PYQ · Algebra · medium

What is the value of [(a+b)² – (a–b)²] / ab?

Answer

The correct answer is D: 4. (a+b)² – (a–b)² = (a²+2ab+b²) – (a²–2ab+b²) = 4ab. Dividing by ab gives 4ab/ab = 4.

  1. A.8
  2. B.2
  3. C.1
  4. D.4✓ Correct

Explanation

(a+b)² – (a–b)² = (a²+2ab+b²) – (a²–2ab+b²) = 4ab. Dividing by ab gives 4ab/ab = 4.
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