Romeo used a mirror to determine the height of Juliet’s window. He stood 0.5m from the mirror and the mirror is
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Yes you can use the discriminant of a quadratic/polynomial. For instance, if
there is one real root. If 
there are two real roots and i
there are no real roots
The discriminant comes from the quadratic equation, which is the following.
The discriminant comes from the quadratic equation, which is the following.