6*a^2 - 5ab - 6b^2 = b^2 *(6*(a/b)^2 - 5*(a/b) - 6)
Рассмотрим многочлен 6*x^2 - 5*x - 6,
D = 5^2 + 4*6^2 = 25 + 4*36 = 25 + 120 + 24 = 169
x1 = (5 + 13)/12 = 18/12 = 3/2; x2 = (5 - 13)/12 = -8/12 = -2/3; 6*x^2 - 5x - 6 = 6*(x - (3/2))*(x + (2/3) ) = ( 2x - 3)*(3x + 2)
x = a/b; 6(a/b)^2 - 5(a/b) - 6 = ( 2(a/b) - 3)*( 3*(a/b) + 2)
домнажаем последнее равенство на b^2: 6a^2 - 5ab - 6b^2 = (2a - 3b)*(3a + 2b)
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