Question

-$x^{2}$+2x-1=0

Answer 1

-x^2+2x-1=0
delta=b^2-4.a.c
delta=2^2-4.(-1).(-1)
delta=4-4
delta=0
x=-b-/+ raiz de delta/2a
x=-2-0/2.(-1)
x=-2/-2
x=1