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NCERT Solutions for Class 11 Maths Chapter 2: Relations and Functions Miscellaneous Exercise- In the previous exercises of this chapter NCERT Solutions For Class 11 Maths Chapter 2 Relations and Functions, you have learned about the relations, domain, codomain, and range of the relations, functions, domain and range of the functions, different types of function and their graphs, etc. In the NCERT solutions for Class 11 Maths chapter 2 miscellaneous exercise, you will get questions related to relations, functions, domain and range of relations and functions, etc. As the name suggests the miscellaneous exercise consists of mixed kinds of questions from all the topics of this miscellaneous exercise class 11 chapter 2.
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If you solved all the previous exercises of this chapter, you can solve all the NCERT problems of class 11 chapter 2 maths miscellaneous solutions by yourself. The miscellaneous exercise Chapter 2 Class 11 is considered to be tougher as compared to the previous exercises of this chapter. So it is not easy to solve these problems on your own at first, but Class 11 Maths chapter 2 miscellaneous exercise solutions are here to help you. You will find all the NCERT problems solved in a descriptive manner. You can NCERT Solutions if you are looking for NCERT solutions for other classes as well.
Also, see
Answer:
It is given that
Now,
And
At x = 3,
Also, at x = 3,
We can see that for , f(x) has unique images.
Therefore, By definition of a function, the given relation is function.
Now,
It is given that
Now,
And
At x = 2,
Also, at x = 2,
We can clearly see that element 2 of the domain of relation g(x) corresponds to two different images i.e. 4 and 6. Thus, f(x) does not have unique images
Therefore, by definition of a function, the given relation is not a function
Hence proved
Question:3 Find the domain of the function
Answer:
Given function is
Now, we will simplify it into
Now, we can clearly see that
Therefore, the Domain of f(x) is
Question:4 Find the domain and the range of the real function f defined by
Answer:
Given function is
We can clearly see that f(x) is only defined for the values of x ,
Therefore,
The domain of the function is
Now, as
take square root on both sides
Therefore,
Range of function is
Question:5 Find the domain and the range of the real function f defined by
Answer:
Given function is
As the given function is defined of all real number
The domain of the function is R
Now, as we know that the mod function always gives only positive values
Therefore,
Range of function is all non-negative real numbers i.e.
Question:6 Let R be a function from R into R. Determine the range of f.
Answer:
Given function is
Range of any function is the set of values obtained after the mapping is done in the domain of the function. So every value of the codomain that is being mapped is Range of the function.
Let's take
Now, 1 - y should be greater than zero and y should be greater than and equal to zero for x to exist because other than those values the x will be imaginary
Thus,
Therefore,
Range of given function is
Question:7 Let f, g : R R be defined, respectively by f(x) = x + 1, g(x) = 2x – 3. Find f + g, f – g and f/g
Answer:
It is given that
Now,
Therefore,
Now,
Therefore,
Now,
Therefore, values of are respectively
Answer:
It is given that
And
Now,
At x = 1 ,
Similarly,
At ,
Now, put this value of b in equation (i)
we will get,
Therefore, values of a and b are 2 and -1 respectively
Question:9 (i) Let R be a relation from N to N defined by . Are the following true?
for all
Answer:
It is given that
And
for all
Now, it can be seen that But,
Therefore, this statement is FALSE
Question:9 (ii) Let R be a relation from N to N defined by . Are the following true?
implies (b,a) R
Answer:
It is given that
And
implies
Now , it can be seen that and , But
Therefore,
Therefore, given statement is FALSE
Question:9 (iii) Let R be a relation from N to N defined by . Are the following true?
(a,b) R, (b,c) R implies (a,c) R.
Answer:
It is given that
And
implies
Now, it can be seen that because and , But
Therefore,
Therefore, the given statement is FALSE
Answer:
It is given that
and
Now,
Now, a relation from a non-empty set A to a non-empty set B is a subset of the Cartesian product A × B
And we can see that f is a subset of
Hence f is a relation from A to B
Therefore, given statement is TRUE
Answer:
It is given that
and
Now,
As we can observe that same first element i.e. 2 corresponds to two different images that is 9 and 11.
Hence f is not a function from A to B
Therefore, given statement is FALSE
Question:11 Let f be the subset of defined by . Is f a function from Z to Z? Justify your answer.
Answer:
It is given that
Now, we know that relation f from a set A to a set B is said to be a function only if every element of set A has a unique image in set B
Now, for value 2, 6, -2, -6
Now, we can observe that same first element i.e. 12 corresponds to two different images that are 8 and -8.
Thus, f is not a function
Answer:
It is given that
A = {9,10,11,12,13}
And
f : A → N be defined by f(n) = the highest prime factor of n.
Now,
Prime factor of 9 = 3
Prime factor of 10 = 2,5
Prime factor of 11 = 11
Prime factor of 12 = 2,3
Prime factor of 13 = 13
f(n) = the highest prime factor of n.
Hence,
f(9) = the highest prime factor of 9 = 3
f(10) = the highest prime factor of 10 = 5
f(11) = the highest prime factor of 11 = 11
f(12) = the highest prime factor of 12 = 3
f(13) = the highest prime factor of 13 = 13
As the range of f is the set of all f(n), where
Therefore, the range of f is: {3, 5, 11, 13}.
Class 11 Maths chapter 2 miscellaneous solutions consists of questions related to relations, functions, finding the domain and range of the functions, etc. There are five examples related to functions and their properties are given before the miscellaneous exercise chapter 2 Class 11. You can go through these examples in order to get conceptual clarity. The topics covered in this exercise are same as the previous exercises of this chapter, so you can solve the problems of this exercise after solving the previous exercises.
Also Read| Relations And Functions Class 11th Notes
Comprehensive Clarification: Miscellaneous exercise class 11 chapter 2 Solutions provide a thorough explanation of all topics, fostering a strong grasp of relations and functions.
Stepwise Clarity: These class 11 chapter 2 maths miscellaneous solutions break down each problem, aiding students in following a logical progression of concepts, and ensuring a smoother understanding.
Clear Conciseness: Presented in clear and concise language, the class 11 maths miscellaneous exercise chapter 2 solutions simplify complex mathematical concepts, enhancing accessibility for students.
Free PDF Access: Additionally, these class 11 chapter 2 miscellaneous exercise solutions offer the convenience of free PDF access, promoting widespread availability and ease of use for all students.
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Happy learning!!!
f(x) = 2x + 3
f(3) = 2(3) + 3 = 6 +3 = 9
f(x) = 2^x + x + 1
f(2) = 2^2 + 2 + 1
f(2) = 4 + 2 + 1 = 7
f(x) = x^2 and g(x) = x + 2
(f+g)(x) = x^2 + x + 2
f(x) = x^2 and g(x) = x + 2
(f-g)(x) = x^2 - x - 2
f(x) = x^2 and g(x) = x + 2
(fg)(x) = (x^2)( x + 2)
(fg)(x) = x^3 + 2x^2
f(x) = x^2 and g(x) = x + 2
(f/g)(x) = (x^2)/( x + 2) where x can't be equal to -2.
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