# NCERT Solutions for Class 9 Maths Chapter 2 Exercise 2.5

NCERT Solutions for class 9 Maths chapter 2 exercise 2.5 Polynomials for CBSE second term exam in free PDF format updated for academic year 2021-2022 based on latest NCERT Books and following the current CBSE Curriculum for this year.

NCERT Solutions 2021-22 are applied for UP Board NCERT Books, CBSE Board and Bihar Board in Hindi Medium and English Medium. You can view these solutions in Video Format also. If you want to use it without downloading, it is given below or you can download (Exercise 2.5) in PDF format for offline use. All solutions are according to Current CBSE Curriculum 2021-22.## NCERT Solutions for Class 9 Maths Chapter 2 Exercise 2.5

Class: 9 | Maths (English and Hindi Medium) |

Chapter 2: | Exercise 2.5 |

### 9th Maths Chapter 2 Exercise 2.5 Solution

Class 9 Maths Chapter 2 exercise 2.5 Polynomial Hindi and English medium solutions are given below to use online or download in PDF form. Go back to Class 9 Maths Chapter 2 Solutions main page to see other exercises. Download Offline Apps for class 9 Maths in Hindi and 9 Maths in English Free.

#### Class 9 Maths Chapter 2 Exercise 2.5 Solution in Hindi Medium Video

#### Class 9 Maths Exercise 2.5 Solutions in Videos

#### 9th Maths Exercise 2.5 Solutions in Hindi and English

Class 9 Maths Polynomials Exercise 2.5 in English & Hindi Medium for Online use is given. These are specially prepared on demand of UP Board / Bihar Board as well as CBSE Board students. Go back to Class 9 Maths Chapter 2 Solutions main page to see other exercises. Visit to Discussion Forum to ask your doubts and response to the questions asked by other users.

##### Practice Questions on 9th Maths Exercise 2.5

1. Set of all natural number is denoted by

(A) N

(B) W

(C) Z

(D) R

2. Set of all whole numbers is denoted by

(A) N

(B) W

(C) Z

(D) Q

3. Set of all integers is denoted by

(A) N

(B) W

(C) Z

(D) Q

4. Set of all rational numbers is denoted by

(A) N

(B) W

(C) Z

(D) Q

5. Which of the following statements is true.

(A) Every whole number is a natural number.

(B) Every integer is a rational number.

(C) Every rational number is an integer.

(D) Every real number is an irrational number.

6. The number ¾ is

(A) A natural number

(B) An integer

(C) A whole number

(D) A rational number

###### Important Questions on 9th Maths Exercise 2.5

1. Which of the following is a rational number between 10 and 11.

(A) 21/4

(B) 87/8

(C) 97/8

(D) 47/4

2. There are how many rational numbers between two given numbers?

(A) Two

(B) Can’t say

(C) Finitely many

(D) Infinitely many

3. √2 belongs to

(A) The set of whole numbers

(B) The set of rational numbers

(C) The set of irrational numbers

(D) The set of natural numbers.

4. The collection of rational numbers and irrational numbers together is called…

(A) The set of whole numbers

(B) The set of real numbers

(C) The set of natural numbers

(D) The set of integers

5. √16 is not …

(A) a natural number

(B) a real number

(C) an irrational number

(D) a whole number

Try to solve yourself and take help through Discussion Forum by asking the questions.

##### What is important to study in exercise 2.5 of class 9th Maths for second term exam?

In exercise 2.5 of 9th Maths, students will study 8 algebraic identities and solve questions using these eight algebraic identities.

8 algebraic identities are:

- Identity I: (x+y)² = x² + 2xy + y².
- Identity II: (x-y)² = x² – 2xy + y².
- Identity III: x²– y² = (x + y) (x – y).
- Identity IV: (x + a) (x + b) = x² + (a + b)x + ab.
- Identity V: (x+y+z)² = x²+y² + z² + 2xy + 2yz + 2zx.
- Identity VI: (x+y)³ = x³ + y³ + 3xy (x + y).
- Identity VII: (x-y)³ = x³ – y³ – 3xy (x-y).

Identity VIII: x³ + y³+ z³ – 3xyz = (x + y + z)( x²+y² + z²–xy–yz–zx).

##### Is exercise 2.5 of class 9th Maths important for the exams?

Yes, exercise 2.5 of class 9th Maths is very important for the exams. Every year questions ask from this exercise in the exam. If students learn all the identities mentioned in section 2.6 of chapter 2 (class 9 Maths) on tips, they can easily solve exercise 2.5 of class 9th Maths. All the questions of this exercise are important.

##### How many good sums are there in exercise 2.5 of class 9th Maths for second term exam?

There are 10 examples (examples 16, 17, 18, 19, 20, 21, 22, 23, 24, 25) and 16 questions in exercise 2.5 of class 9th Maths. All the questions and examples of this exercise are good, interesting and logical. All questions of this exercise are of a different type.

##### How much time, students need to do exercise 2.5 of class 9th Maths?

Students need a maximum of 3 days to complete exercise 2.5 (chapter 2) of class 9th mathematics if they give at least 1-2 hours per day to this exercise. This time also depends on student’s speed, efficiency and capability.