Evaluate : (5p - 7q)² using suitable identity.
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Answer:
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- Answer :-
→ (5p - 7q)²
→ (5p)² + (7q)² - 2 × 5p × 7q
→ 25p² + 49q² - 70pq
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- (a - b)² = a² + b² - 2ab
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