Laetus, Marcia, and one athlete – assassin of Roman emperor Commodus Planner: Laetus Assassins: Marcia and an unnamed athlete who strangled the emperor in his bath when Marcia's poison worked too slowly.
... denominator is 4a2. We get
<math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math>
Taking square roots of both sides ...