CBSE Mathematics Class XI

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Mathematics - CBSE CLASS XI

Mathematics

 

Solution:

In Form One we have learned that any number that divided by zero will result infinity or undefined. For part (a), if there is given an expression which is a fraction there must be given an information that

The value of unknown in the denominator that it cannot be. For example,

part of denominator is x - 2 . If x = 2 , the denominator would be 0 and the solution will be undefined or infinity. So x cannot equal to 2. For the question above, we know that x cannot equal to 1 because if x = 1,the denominator would be 0 and the solution will be undefined or infinity. It is given that x � k . We already know that x � 1. So compare these two equations and it would result k = 1. So 1 is the answer for part (a)

Example 3 :

The following information refers to the functions f and g.

CBSE Mathematics Class XI ( By Mr. Ayaz Khan )
Email Id : [email protected]