2х²+8х=х²+4
х²+8х-4=0
Д1=16+4=20 √20=√4×5=2√5
х1=-4+2√5 х2=-4-2√5
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2х²+8х=х²+4
х²+8х-4=0
Д1=16+4=20 √20=√4×5=2√5
х1=-4+2√5 х2=-4-2√5