Question

bháskara
 B) -x²+2 x -1=0 resposta 

Answer 1

$-x^2+2x-1=0\\\Delta=b^2-4ac\\\Delta=2^2-4.(-1).(-1)\\\Delta=0\\ \\x= \frac{-b\pm\sqrt\Delta}{2a}$

$x= \frac{-2}{-2} \\ \\x=1$