Question

X^2-5x-6=0

Answer 1

Are you sure that's the correct formula? Or are you expecting complex roots?

Answer 2

That has real roots

Answer 3

Oops, so it does lol, my bad.

x^2-5x-6=(x-2.5)^2-12.25=0
=> (x-2.5)^2=12.25
=> x-2.5=3.5 OR x-2.5=-3.5
=> x=6 OR x=-1