a^2-7a+12=(а-3)(а-4)
(а-3)(а-4)(а-3)(а-4)=(а-3)^2(a-4)^2
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a^2-7a+12=(а-3)(а-4)
(а-3)(а-4)(а-3)(а-4)=(а-3)^2(a-4)^2
(a-3)(a-4) / (a^2-7a+12)
a² - 7a + 12 = 0
D = 49 - 4*1*12 = 1
a₁ = (7 - 1)/2 = 3
a₂ = (7 + 1)/2 = 4
a² - 7a + 12 = (a - 3)*(a - 4)
(a-3)*(a-4) / (a - 3)*(a - 4) = 1