Question

reduza x²₋10x ₊9=0

Answer 1

-b/c = 10/9 = 1+9/1×9 => x'=1 , x"=9

Answer 2

${x}^{2} - 10x + 9 = 0$
${x}^{2} - 9x - x + 9 = 0$
$x(x - 9) - (x - 9) = 0$
$(x - 9)(x - 1) = 0$