Question

What is log base if base is not defiend in log?

Answer 1

If log base is not given
then its base is '10'.

Answer 2

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The real logarithmic function logb(x) is defined only for x>0. We can't find a number x, so the base b raised to the power of x is equal to zero: b x = 0 , x does not exist. So the base b logarithm of zero is not defined.