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⇔ 5x² + 30x - 2x - 12
⇔ 5x (x + 6) - 2 (x + 6)
⇔ (5x - 2) (x + 6)
2. 2x² - 2x- 24
⇔ 2x² - 8x + 6x - 24
⇔ 2x (x - 4) + 6 (x - 4)
⇔ (2x + 6) (x - 4)
3. 3x² + 8x + 4
⇔ 3x² + 6x + 2x + 4
⇔ 3x (x + 2) + 2 (x + 2)
⇔ (3x + 2) (x + 2)
4. 3x² - 16x + 5
⇔ 3x² - x - 15x + 5
⇔ x (3x - 1) - 5 (3x - 1)
⇔ (x - 5) (3x - 1)
5. 2x² + 7x - 30
⇔ 2x² + 12x - 5x - 30
⇔ 2x (x + 6) - 5 (x + 6)
⇔ (2x - 5) (x + 6)