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Verified answer
1) (64x^5b²) ÷ (8x⁴b) = 8xb2) 2x^5yz⁴ ÷ 3xy⁴z = 2x⁴z³ / 3y³
3) (4a³b - 20ab² + 8a²b) ÷ 4ab
= 4ab (4a² - 5b + 2a)
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4ab
= 4a² - 5b + 2a
4) 2x² - x - 10
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x + 2
= (2x - 5)(x + 2)
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(x + 2)
= 2x - 5