what if I give you the wrong answer
If log(x) = y then log(x3) = 3*log(x) = 3*y so that x3 = antilog(3*y) So, to find the cibe of x 1) find log x 2) multiply it by 3 3) take the antilog of the result.
Suppose you want to divide x by y Find log(x) and log(y) to any base b (usually 10 or e) Calculate z = log(x) - log(y) Look up the antilog of z (or find the number whose log is z). x/y = antilog(z)
If you are using a scientific calculator you will have a key labelled "log". To find the logarithm (to base 10) of a number, simply enter "log" followed by the number that you want to log. If you want a natural logarithm - log to the base e - use the "ln" key instead. If you haven't got a scientific calculator, use the one on your computer.
The calculator won't do it.On the calculator, the button marked 10x gives youthe inverse log of the number in the window.
The 2nd function of the log button is the inverse log. Press 2nd log, which displays 10^( on the screen. Put a number after the opening parenthesis.
You look them up in log tables, or use a scientific calculator. The calculators use a method based on the Taylor series.
Although it's certainly possible, the log function is one thing that's not practical to compute with pencil and paper. Typical methods are with the use of a slide rule, calculator, or tables in a book.
Well, isn't that just a happy little question! To find the antilog of a negative number using a log table, you can start by taking the absolute value of the negative number to make it positive. Then, look up the positive number in the log table to find its corresponding antilog. Remember, there are no mistakes in math, just happy little accidents!
Various methods, but you will need some sort of calculating device. The easiest is to use a pocket calculator or computer spreadsheet and enter 2^1.4 If you do not have such a device, your next best bet is to use log tables. 2^1.4 = ??? → log(2^1.4) = log(???) → 1.4 × log(2) = log(???) → base^(1.4 × log(2)) = base^(log(???)) = ??? So, using any base multiply the log of 2 by 1.4 and find the anti-log of that value. Using 4-figure logs to base 10: 2^1.4 = 10^(1.4 × log 2)) (in my tables I convert 2.000 to 20-0-0 to find 20-0 gives me 3010) ≈ 10^(1.4 × 0.3010) = 10^(0.4214) (in my tables I find 26-3 gives 4200, 26-4 gives 4216, mean difference 8 gives 13, 9 gives 15, so round up making the anti-log:) ≈ 2.64
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Unless the number happens to be a straightforward power of the base of the logs, the answer is that you cannot without some access to tables or a scientific calculator. There are Maclaurin series for the log function but without a powerful calculator, you will not get far with them.
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