The equation for beat frequency is as follows:(adsbygoogle = window.adsbygoogle || []).push({});

f_b = |f_2 - f_1|

Meaning the absolute value of the difference between 2 frequencies. But when you figure out the possiblilities of f_2, you analyze both -f_b and f_b, if you are using the absolute value because negative beat frequencies don't exsist, then why do you analyze the negative beat frequency? You calulate as:

f_2 = f_b + f_1

OR

f_2 = -f_b + f_1

I don't see why you should analyze the negative beat frequency if it doesn't exsist.

Someone please help soon.

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# Negative Beat frequency

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