# NCERT Solutions for Exercise 7.4 Class 12 Maths Chapter 7 - Integrals

In NCERT solutions for Class 12 Maths chapter 7 exercise 7.4, logarithmic functions, parabolic functions etc. are discussed in detail. These concepts are going to help in subsequent Class 12 chapters also. **Exercise 7.4 Class 12 Maths** is an extension of the earlier exercises with a slightly more difficulty level. NCERT solutions for Class 12 Maths chapter 7 exercise 7.4 provided below are of good quality prepared by subject matter experts. Questions from this NCERT book exercise can be solved by students to increase their speed with accuracy in Integrals. Since speed is also a parameter in scoring well in exams like JEE Main. Also the NCERT chapter Integrals consists of other exercises which are as follows.

Integrals Exercise 7.1

Integrals Exercise 7.2

Integrals Exercise 7.3

Integrals Exercise 7.5

Integrals Exercise 7.6

Integrals Exercise 7.7

Integrals Exercise 7.8

Integrals Exercise 7.9

Integrals Exercise 7.10

Integrals Exercise 7.11

Integrals Miscellaneous Exercise

**Integrals ****Class 12 ****Chapter 7** **Exercise 7.4 **

**Integrals**

### ** Question:1 ** Integrate the functions

### ** Answer: **

The given integral can be calculated as follows

Let

, therefore,

### ** Question:2 ** Integrate the functions

### ** Answer: **

let suppose 2x = t

therefore 2dx = dt

.................using formula

### ** Question:3 ** Integrate the functions

### ** Answer: **

let suppose 2-x =t

then, -dx =dt

using the identity

### ** Question:4 ** Integrate the functions

### ** Answer: **

Let assume 5x =t,

then 5dx = dt

The above result is obtained using the identity

### ** Question:5 ** Integrate the functions

### ** Answer: **

Let

The integration can be done as follows

### ** Question:6 ** Integrate the functions

### ** Answer: **

let

then

using the special identities we can simplify the integral as follows

### ** Question:7 ** Integrate the functions

### ** Answer: **

We can write above eq as

............................................(i)

for let

Now, by using eq (i)

### ** Question:8 ** Integrate the functions

### ** Answer: **

The integration can be down as follows

let

........................using

### ** Question:9 ** Integrate the functions

### ** Answer: **

The integral can be evaluated as follows

let

### ** Question:10 ** Integrate the functions

### ** Answer: **

the above equation can be also written as,

let 1+x = t

then dx = dt

therefore,

### ** Question:11 ** Integrate the functions

### ** Answer: **

###

this denominator can be written as

Now,

......................................by using the form

### ** Question:12 ** Integrate the functions

### ** Answer: **

the denominator can be also written as,

therefore

Let x+3 = t

then dx =dt

......................................using formula

### ** Question:13 ** Integrate the functions

### ** Answer: **

(x-1)(x-2) can be also written as

=

=

therefore

let suppose

Now,

.............by using formula

### ** Question:14 ** Integrate the functions

### ** Answer: **

We can write denominator as

therefore

let

### ** Question:15 ** Integrate the functions

### ** Answer: **

(x-a)(x-b) can be written as

let

So,

### ** Question:16 ** Integrate the functions

### ** Answer: **

let

By equating the coefficient of x and constant term on each side, we get

A = 1 and B=0

Let

### ** Question:17 ** Integrate the functions

### ** Answer: **

let

By comparing the coefficients and constant term on both sides, we get;

** A=1/2 and B=2 then **

** **

### ** Question:18 ** Integrate the functions

### ** Answer: **

let

By comparing the coefficients and constants we get the value of A and B

A = and B =

NOW,

...........................(i)

put

Thus

### ** Question:19 ** Integrate the functions

### ** Answer: **

let

By comparing the coefficients and constants on both sides, we get

A =3 and B =34

....................................(i)

Considering

let

Now consider

here the denominator can be also written as

Dr =

Now put the values of and in eq (i)

### ** Question:20 ** Integrate the functions

### ** Answer: **

let

By equating the coefficients and constant term on both sides we get

** A = -1/2 and B = 4 **

** (x+2) = -1/2(4-2x)+4 **

** ....................(i) **

** Considering let now, **

** **

** put the value of and **

### ** Question:21 ** Integrate the functions

### ** Answer: **

...........(i)

take

let

considering

putting the values in equation (i)

### ** Question:22 ** Integrate the functions

### ** Answer: **

Let

By comparing the coefficients and constant term, we get;

A = 1/2 and B =4

..............(i)

put

### ** Question:23 ** Integrate the functions

### ** Answer: **

let

On comparing, we get

A =5/2 and B = -7

...........................................(i)

put

### ** Question:24 ** Choose the correct answer

### ** Answer: **

The correct option is (B)

the denominator can be written as

now,

### ** Question:25 ** Choose the correct answer

### ** Answer: **

The following integration can be done as

The correct option is (B)

**More About NCERT Solutions for Class 12 Maths Chapter 7 Exercise 7.4**

The NCERT Class 12 Maths chapter Integrals is a good source to cover integrals from basics to advanced level. Exercise 7.4 Class 12 Maths can help students to get an idea of types of questions asked in the examination. Overall NCERT solutions for Class 12 Maths chapter 7 exercise 7.4 is a good source to practice before the exam.

**Also Read| **Integrals Class 12 Notes

**Benefits of NCERT Solutions for Class 12 Maths Chapter 7 Exercise 7.4**

It is advised to students to practice Exercise 7.4 Class 12 Maths to get good marks in examinations.

These Class 12 Maths chapter 7 exercise 7.4 questions can be asked directly in the Board exams as well as competitive exams.

NCERT solutions for Class 12 Maths chapter 7 exercise 7.4 are highly recommended to students.

**Also see-**

- NCERT Exemplar Solutions Class 12 Maths Chapter 7
NCERT Solutions for Class 12 Maths Chapter 7

**NCERT Solutions Subject Wise**

NCERT Solutions Class 12 Chemistry

NCERT Solutions for Class 12 Physics

NCERT Solutions for Class 12 Biology

NCERT Solutions for Class 12 Mathematics

**Subject Wise NCERT Exemplar Solutions**

NCERT Exemplar Class 12 Maths

NCERT Exemplar Class 12 Physics

NCERT Exemplar Class 12 Chemistry

NCERT Exemplar Class 12 Biology

Happy learning!!!