представьте в виде произведения a^2-x^2-6x-9
... = -x^2 - 6x - 9 + a^2 = -(x^2 + 6x + 9 - a^2)
D = 36 - 4*(9 - a^2) = 4a^2
(x)1;2 = (-6 +- 2a)/2 = -3 +- a
... = -(x + 3 + a)(x + 3 - a) = (x + 3 + a)(a - x - 3) = (a + x + 3)(a - x - 3)
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... = -x^2 - 6x - 9 + a^2 = -(x^2 + 6x + 9 - a^2)
D = 36 - 4*(9 - a^2) = 4a^2
(x)1;2 = (-6 +- 2a)/2 = -3 +- a
... = -(x + 3 + a)(x + 3 - a) = (x + 3 + a)(a - x - 3) = (a + x + 3)(a - x - 3)