Question

Cum se descompune : xpatrat + 5x + 2 ?

Answer 1

$Ecuatia\ x^2+5x+2=0, \ are\ \Delta=25-8=17\ deci:$

$x_{1;2}=\dfrac{-5\pm\sqrt{17}}{2}$

$Folosind \ formula\ ax^2+bx+c=a(x-x_1)(x-x_2)\ obtinem:$

$x^2+5x+2=(x+\dfrac{5+\sqrt{17}}{2})(x+\dfrac{5-\sqrt{17}}{2})$