Someone please help me with this

This is (E/m) all to the 1/2 power

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Work Shown:

The idea is to first isolate by dividing both sides by m. This undoes the multiplication of m and

The next step is to fully isolate c. One way is to apply the square root. Another way is to raise both sides to the 1/2 power. Either way, that will get c all by itself.

Side note:

So this means that

A rational exponent is the same as a fractional exponent.

this doesn't make sense lol