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x(x - 2b)² = x(x² + 6x + 9) /:x
x ≠ 0
(x - 2b)² = x² + 6x + 9
x² - 4b + 4b² = x² + 6x + 9
-4b = 6 /:(-4)
b = -3/2
4b² = 9 /:4
b = -3/4 v b = 3/4
Oba warunki spełnia wartość: b = -3/2
b = -3/2 = -1,5