Answer:
1. (x - 5) (x + 5)
x² + 5x - 5x - 25
x² - 25
2. (x - 7)²
(x - 7) (x - 7)
x² - 7x - 7x + 49
x² - 14x + 49
3. (x + 3) (2x + 8)
2x² + 8x + 6x + 24
2x² + 14x + 24
4. (x + 7)³
(x + 7) (x + 7) (x + 7)
x² + 7x + 7x + 49 (x + 7)
x³ + 7x² + 7x² + 49x + 343
x³ + 14x² + 49x + 343
5. (2x + 3) (2x - 3)
4x² - 6x + 6x - 9
4x² - 9
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