Question

Salut am o intrebare!   cu  sa scriu 2x²-x-1 ca binom??        As vrea raspuns fast   Mercii ;))

Answer 1

$2x^{2} - x - 1$
Δ = 1 + 8 = 9 => $x_{1} = \frac{1+3}{4} = 1$

                             $x_{2} = \frac{1-3}{4} = \frac{-2}{4} = - \frac{1}{2}$

      $2 x^{2} - x - 1 = 2 ( x - x_{1} ) ( x - x_{2} ) = 2 ( x - 1) ( x + \frac{1}{2} ) = ( x - 1 ) ( 2x +1 )$