Logarithms


Definition of Indices :

The product of m factors each equal to a is represented by am . So, aᵐ = a · a · a ........ a ( m times).

Here a is called the base and m is the index (or power or exponent).

Law of Indices :



 LOGARITHM 

The logarithm of the number N to the base ' a ' is the exponent indicating the power to which the base ' a ' must be raised to obtain the number N. This number is designated as 







PROPERTIES 








Some Important points.






 






Systems of Logarithm :

There are two systems of logarithm which are generally used.

(i) Common logarithm : In this system base is always taken as 10.

(ii) Natural logarithm : In this system the base of the logarithm is taken as ‘e’. Where ‘e’ is an irrational

number lying between 2 and 3.( The approximate value of e upto two decimal places is e = 2.73)


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