(a-1)(a+2) = a² + 2a - a + 1 = a² - a + 1
(а+4)(а-3) = a² - 3a + 4a + 1 = a² - a + 1
(a-1)(a+2) = (а+4)(а-3)
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(a-1)(a+2) = a² + 2a - a + 1 = a² - a + 1
(а+4)(а-3) = a² - 3a + 4a + 1 = a² - a + 1
(a-1)(a+2) = (а+4)(а-3)