factories: 3a^2b-27a^4b
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Step-by-step explanation:
3a²b - 27a⁴b
= 3a²b(1 - 9a²)
= 3a²b[(1)² - (3a)²]
= 3a²b(1 + 3a)(1 - 3a). [a² - b² = (a + b)(a - b)]
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