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x2 = 6
x1 + x2 = -b/a
-4 + 6 = -b/a
2 = -b/a
x1 . x2 = c/a
-4 . 6 = c/a
-24 = c/a
pers = ax²+bx+c
= x²-2x-24
x² + 6x - 4x - 24
x² + 2x - 24