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2(x-1)la a 2 paranteza =72

Răspuns :

2( xpatrat-2•x•1 +1 la patrat) =72
2( x patrat-2x+1)=72
2xpatrat -4x +2-72=0
2xpatrat -4x-70=0
delta = 16 - 4•2•70
delta = 16 - 560
delta = -544 => nu are solutii reale