As a refresher, I was skimming through a free Calculus online textbook "MOOCULUS massive open online calculus" (https://mooculus.osu.edu/handouts) and stumbled upon the following example solving a quadratic equation via the quadratic formula:
Is the step where they get rid of the
-10 in the denominator correct? I am wondering because
!= sqrt(8.1) for example.