625 = 54
So the 4th root of 54 would be 5.
You can find this by going to your calculator and typing in 625^(1/4), and you should end up with 5. Another way to think about this is what number times itself 4 times is 625.
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Negative fourth root of a number= 1/the fourth root of the number. Fourth root of 625= 5 (5*5*5*5) 1/5
6251/4 = 5
± 5 to the fourth power equals 625.
5 and -5
625/10000 :]