36(x + y)^2 - 25(c + d)^2
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The correct answer is : x² + y²
The method used here is :
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Answer:
» 36 (x + y)² - 25 (c + d)²
= 36 (x² + y² + 2xy) - 25 (c² + d² + 2cd)
= 36x² + 36y² + 72xy - 25c² - 25d² - 50cd
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