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a fost răspuns

Cum se descompune : xpatrat + 5x + 2 ?

Răspuns :

[tex]Ecuatia\ x^2+5x+2=0, \ are\ \Delta=25-8=17\ deci:[/tex]

[tex]x_{1;2}=\dfrac{-5\pm\sqrt{17}}{2}[/tex]

[tex]Folosind \ formula\ ax^2+bx+c=a(x-x_1)(x-x_2)\ obtinem:[/tex]

[tex]x^2+5x+2=(x+\dfrac{5+\sqrt{17}}{2})(x+\dfrac{5-\sqrt{17}}{2})[/tex]