Finding Roots with a Scientific CalculatorDate: 05/15/2000 at 00:11:09 From: Tom Pickett Subject: 8th Root of a Number How do you calculate the 8th root of a number using a scientific calculator? Also, how do you do any other roots besides the square root using a calculator? Date: 05/15/2000 at 08:54:42 From: Doctor Rick Subject: Re: 8th Root of a Number Hi, Tom - The 8th root can be calculated pretty simply: just press the square root key 3 times. That's because the square of the square of a number is the 4th power of the number, and the square of the 4th power is the 8th power. In general, the nth root of a number is the same as the (1/n)th power of the number. Your calculator probably has a key marked "x to the y power" in some fashion (I'll write it "x^y"), as well as a key marked "1/x" . If it has the same operation precedence rules as my calculator, you can enter: 256 [x^y] 8 [1/x] [=] to get the 8th root of 256. What you've just calculated (if it works correctly) is 1/8 256 = 2 If it doesn't work correctly, you might need to put parentheses around the (8 [1/x]). - Doctor Rick, The Math Forum http://mathforum.org/dr.math/ |
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