answersLogoWhite

0


Best Answer

The logarithm function is the inverse of the exponential function. Take the exponential function (base 10): y = 10x. The inverse of this is x = 10y. The function y = log(x) is used to define this inverse function.

First look at y = 10x. Any real value of x will yield a positive real value for y. If x = 0, then y = 1; if x < 0 (negative) then y is between 0 and 1 (it will never equal zero, though). A value of 10-99999 is very close to zero, but not quite there. There are no real values of x which will give a negative y value for y = 10x.

Now look at y = log(x) or x = 10y. No matter what real values for y, that we choose, x will always be a positive number, so a negative value of x in y = log(x) is not possible if you are limiting to real numbers.

It is possible with complex and imaginary numbers to take a log of a negative number, or to get a negative answer to y = 10x.

User Avatar

Wiki User

13y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Why negative value is not valid for log?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

What is gernal value of log y?

Log(y) can be any number, positive or negative, no limits. It all depends on the value of 'y'.


What is the value of log 0?

Value of log 0 is negative infinity (undefined). Because no power can give an answer of zero. it is in fact undefined but written as negative infinity for symbolizing. Otherwise undefined and infinity are two different things.


What is the pH of a solution with H plus 2.3x 10-9?

Since the pH is defined as the negative log of the H+ concentration, one simply needs to take the negative log of 2.3x10^-9. This value = pH = 8.6


Which of the following is not a valid way to log out of gcss?

which of the following is not a valid way to log out of gcss


What is the pH value of bread?

pH is the negative log of the activity of the hydrogen ion in an aqueous solution. A powder is not a solution.


What is the pH value of bread powder?

pH is the negative log of the activity of the hydrogen ion in an aqueous solution. A powder is not a solution.


What does -log represent in the pH formula?

It is the negative value of the 10-base logarithmof [positive real number](cf. mathematics)


What is included in the valid payment log?

Authorization number


Why can't you take the log of a negative number?

the log of a number, X, is equal to some value , N, and by definition 10 to the N power =X 10 to any power is always positive


What is the value of log o?

The value of log o is penis


What is -log equivalent to?

The negative log of a number is the log of the number's reciprocal ('1' divided by the number).


How can you find value of logarithm from log table?

determination of log table value