(a + b)² + (a - b)² = _____?
JEST Past Papers / All — Multiple-choice practice
- A. a² - b²
- B. 2a² + 2b²
- C. a² + b²
- D. None of these
Correct answer
2a² + 2b²
Explanation
Explanation Let's expand both expressions: (a + b)² = a² + 2ab + b² (a - b)² = a² - 2ab + b² Now, add them: (a + b)² + (a - b)² = a² + 2ab + b² + a² - 2ab + b² = 2a² + 2b²
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