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Sa se afle x .: (x+1)(x+2)=56 multumesc anticipat

Răspuns :

[tex](x+1)(x+2)=56 \\ x^{2} +2x+x+2=56 \\ x^{2} +3x+2=56 \\ \Delta=9-4*2=9-8=1 \\ x_1= \frac{-3-1}{2}= \frac{-4}{2}=-2 \\ x_2=\frac{-3+1}{2}= \frac{-2}{2}=-1[/tex]
S={-2, -1}

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