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rezolvati ecuatia : x patrat +3x+9=3x

Răspuns :

xpatrat=3x-3x-9
x patrat=-9
x=radical din -9
x=-3.
x²+3x+9=3x
x²+3x+9-3x=0
+3x si -3x se reduc
x²+9=0
x²=-9
S={+-3}