Co-channel interference is interference from 2 different radio stations on the same frequency. On AM, both stations are on top of each other, with a heterodyne sound. On FM, the stronger signal is captured and demodulated, but while moving, multipath effects cause both stations to appear on the same frequency.

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... x, both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.)
If the discriminant is negative, then there are two ...