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2014-03-30T12:16:19+03:00
79-2(x+1)²=47
2(x+1)²=32
(x+1)²=16
Si avem 2 cazuri:
1) x+1=4 => x=3
2) x+1=-4 => x=-5



1 5 1
2014-03-30T12:22:32+03:00
79-2(x²+1+2x)=47 79-2x²-2-4x=47 -2x²-4x=47-77 -2x²-4x=-30/•(-1) 2x²+4x=30/:2 x²+2x=15 x(x+2)=15 x=15 x+2=15 X=13