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a^2-b^2=(a+b)(a-b)
(10a^2+3a+2b)(10a^2-3a-2b)
= (10a²)² - (3a + 2b)²
= (10a² - (3a + 2b))(10a² + (3a + 2b))
= (10a² - 3a - 2b)(10a² + 3a + 2b)