Question

a) x^2 -6x+9=0 b) -x^2+2x-1=0

Answer 1

$x^{2} -6x+9=0 \\ (x-3)^2=0 \\ x=3 \\ b)- x^{2} -2x-1=0 \\ -( x^{2} +2x+1)=0 \\ -(x+1)^2=0 \\ x+1=0$
$x=-1$