Hi there!
[tex]8 = {x}^{2} - 2x[/tex]
Bring all terms to the left.
[tex] - {x}^{2} + 2x + 8 = 0[/tex]
Divide by -1.
[tex] {x}^{2} - 2x - 8 = 0[/tex]
Factoring
[tex](x - 4)(x + 2) = 0[/tex]
Rule AB = 0, so A = 0 or B = 0.
[tex]x - 4 = 0[/tex]
[tex]x = 4[/tex]
OR
[tex]x + 2 = 0[/tex]
[tex]x = - 2[/tex]
