Якщо х1 і х2 - корені квадратного рiвняння x² - 2х - 9 = 0.

A) x1 +x2= 2; x1 x2=9
Б) x1 +x2= -3 ; x1 x2=9
B) x1+ x2= -2: x1 x2=-9
Г) x + x2= 2; x1 X2= -9
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