Answer:
1. (x-6)(x+1)
Verify = x² + x - 6x - 6 = x² - 5x - 6
2. (x+8)(x-5)
Verify = x² - 5x + 8x - 40 = x² +3x - 40
3. (x-10)(x+3)
Verify = x² + 3x - 10x - 30 = x² - 7x - 30
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