answers:
1. (a + 4) (a - 4) = a² - 16
2. (2m -5) (2m + 5) = 4m² - 25
3. (2x + 7)²= 4x² + 28x + 49
4. (x - 2)² = x² - 4x + 4
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Answers & Comments
answers:
1. (a + 4) (a - 4) = a² - 16
2. (2m -5) (2m + 5) = 4m² - 25
3. (2x + 7)²= 4x² + 28x + 49
4. (x - 2)² = x² - 4x + 4