1) 16(а+в)²-9(х+у)² = 16а² + 32 ав + 16в² - 9х² - 18ху - 9у²
2) 9(а-в)²-4(x-y)² = 9а² - 18ав + 9в² - 4х² +8ху - 4у²
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Answers & Comments
1) 16(а+в)²-9(х+у)² = 16а² + 32 ав + 16в² - 9х² - 18ху - 9у²
2) 9(а-в)²-4(x-y)² = 9а² - 18ав + 9в² - 4х² +8ху - 4у²