Question

qual a resposta dessa? (x+1)(x-1)​

Answer 1

Resposta:

Explicação passo-a-passo:

(x+1)(x-1)=

$x^{2}$-x+x-1=

$x^{2}$-1=

$b^{2}$-4ac

$0^{2}$-4.1.(-1)=

0+4=4

-b±√Δ

  2a

0±√4=    $x_{1}$=$\frac{0+2}{2}$= $\frac{2}{2}$=1

 2.1        

                $x_{2}$=$\frac{0-2}{2}$=$\frac{-2}{2}$=(-1)