Carrier Frequency is the fundamental frequency used in both amplitude modulation and frequency modulation i.e. it is the frequency which is modulated and is the frequency to which a receiver should be tuned in order to demodulate[?] the information signal.
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The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of those element(s) of the field whose square equals b2 - ...