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NCERT Solutions for Exercise 4.1 Class 10 Maths Chapter 4 - Quadratic Equations

NCERT Solutions for Exercise 4.1 Class 10 Maths Chapter 4 - Quadratic Equations

Edited By Komal Miglani | Updated on Apr 29, 2025 05:30 PM IST

Quadratic equations are nothing but a polynomial with degree 2. The general form of the quadratic equation in the variable x is ax2+ bx + c = 0, where a, b, and c are real numbers. Any equation that is in the form p(x) = 0 is a polynomial equation if the degree of x is 2. If the terms of p(x) are in descending order of degree, then this quadratic equation is called the standard quadratic equation. Before solving the quadratic equations, the equations need to simplify the equation and compared with the standard quadratic equation to determine whether the equation is in the standard form or not.

This Story also Contains
  1. Download Free Pdf of NCERT Solutions for Class 10 Maths Chapter 4 Exercise 4.1
  2. Assess NCERT Solutions for Class 10 Maths Chapter 4 Exercise 4.1
  3. Topics Covered in Chapter 4 Pair of Quadratic Equations: Exercise 4.1
  4. NCERT Solutions of Class 10 Subject Wise
  5. NCERT Exemplar Solutions of Class 10 Subject Wise
NCERT Solutions for Exercise 4.1 Class 10 Maths Chapter 4 - Quadratic Equations
NCERT Solutions for Exercise 4.1 Class 10 Maths Chapter 4 - Quadratic Equations

These NCERT solutions for Class 10 Maths exercise 4.1 focused on the concepts of solving quadratic equations and understanding more about the relationship between the roots of the equation and the nature of the equation. These questions are based on the NCERT Books, which are the foundation for the quadratic equation and help to solve the quadratic equation. This exercise lays the foundation of a quadratic equation. To solve the equations student must know how to simplify the equation and determine whether the equation is quadratic or not, and this exercise will help the student with the same. This exercise also explains the method of converting word problems into a standard quadratic equation.

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Download Free Pdf of NCERT Solutions for Class 10 Maths Chapter 4 Exercise 4.1

Download PDF

Assess NCERT Solutions for Class 10 Maths Chapter 4 Exercise 4.1

Q1 (i) Check whether the following are quadratic equations: (x+1)2=2(x3)

Answer:

We have L.H.S. (x+1)2=x2+2x+1

Therefore, (x+1)2=2(x3) can be written as:

x2+2x+1=2x6

i.e., x2+7=0

Or x2+0x+7=0

This equation is of the type: ax2+bx+c=0.

Hence, the given equation is a quadratic equation.

Q1 (ii) Check whether the following are quadratic equations: x22x=(2)(3x)

Answer:

Given equation x22x=(2)(3x) can be written as:

x22x=6+2x

i.e., x24x+6=0

This equation is of the type: ax2+bx+c=0.

Hence, the given equation is a quadratic equation.

Q1 (iii) Check whether the following are quadratic equations: (x2)(x+1)=(x1)(x+3)

Answer:

L.H.S. (x2)(x+1) can be written as:

=x2+x2x2=x2x2

and R.H.S (x1)(x+3) can be written as:

=x2+3xx3=x2+2x3

x2x2=x2+2x3

i.e., 3x1=0

The equation is of the type: ax2+bx+c=0,a0.

Hence, the given equation is not a quadratic equation since a = 0.

Q1 (iv) Check whether the following are quadratic equations: (x3)(2x+1)=x(x+5)

Answer:

L.H.S. (x3)(2x+1) can be written as:

=2x2+x6x3=2x25x3

and R.H.S (x)(x+5) can be written as:

=x2+5x

2x25x3=x2+5x

i.e., x210x3=0

This equation is of type: ax2+bx+c=0,a0.

Hence, the given equation is a quadratic equation.

Q1 (v) Check whether the following are quadratic equations: (2x1)(x3)=(x+5)(x1)

Answer:

L.H.S. (2x1)(x3) can be written as:

=2x26xx+3=2x27x+3

and R.H.S (x+5)(x1) can be written as:

=x2x+5x5=x2+4x5

2x27x+3=x2+4x5

i.e., x211x+8=0

This equation is of type: ax2+bx+c=0,a0.

Hence, the given equation is a quadratic equation.

Q1 (vi) Check whether the following are quadratic equations: x2+3x+1=(x2)2

Answer:

L.H.S. x2+3x+1

and R.H.S (x2)2 can be written as:

=x24x+4

x2+3x+1=x24x+4

i.e., 7x3=0

This equation is NOT of type: ax2+bx+c=0,a0.

Here, a = 0, hence, the given equation is not a quadratic equation.

Q1 (vii) Check whether the following are quadratic equations:(x+2)3=2x(x21)

Answer:

L.H.S. (x+2)3 can be written as:

=x3+8+6x(x+2)=x3+6x2+12x+8

and R.H.S 2x(x21) can be written as:

=2x32x

x3+6x2+12x+8=2x32x

i.e., x36x214x8=0

This equation is NOT of type: ax2+bx+c=0.

Hence, the given equation is not a quadratic equation.

Q1 (viii) Check whether the following are quadratic equations: x34x2x+1=(x2)3

Answer:

L.H.S. x34x2x+1 ,

and R.H.S (x2)3 can be written as:

=x36x2+12x8

x34x2x+1=x36x2+12x8

i.e., 2x213x+9=0

This equation is of the type: ax2+bx+c=0.

Hence, the given equation is a quadratic equation.

Q2 (i) Represent the following situations in the form of quadratic equations: The area of a rectangular plot is 528m2. The length of the plot (in meters) is one more than twice its breadth. We need to find the length and breadth of the plot.

Answer:

Given that the area of a rectangular plot is 528m2.

Let the breadth of the plot be b.

Then, the length of the plot will be: =2b+1.

Therefore, the area will be:

=b(2b+1) m2 which is equal to the given plot area 528m2.

2b2+b=528

2b2+b528=0

Hence, the length and breadth of the plot will satisfy the equation 2b2+b528=0

Q2 (ii) Represent the following situations in the form of quadratic equations:The product of two consecutive positive integers is 306. We need to find the integers.

Answer:

Given that the product of two consecutive integers is 306.

Let two consecutive integers be x and x+1.

Then, their product will be:

x(x+1)=306

Or x2+x306=0 .

Hence, the two consecutive integers will satisfy this quadratic equation x2+x306=0.

Q2 (iii) Represent the following situations in the form of quadratic equations:Rohan’s mother is 26 years older than him. The product of their ages (in years) 3 years from now will be 360. We would like to find Rohan’s present age.

Answer:

Let the age of Rohan be x years.

Then his mother's age will be: x+26 years.

After three years,

Rohan's age will be x+3 years, and his mother's age will be x+29 years.

Then, according to the question,

The product of their ages 3 years from now will be:

(x+3)(x+29)=360

x2+3x+29x+87=360 Or

x2+32x273=0

Hence, the age of Rohan satisfies the quadratic equation x2+32x273=0.

Q2 (iv) Represent the following situations in the form of quadratic equations: A train travels a distance of 480 km at a uniform speed. If the speed had been 8 km/h less, then it would have taken 3 hours more to cover the same distance. We need to find the speed of the train.

Answer:

Let the speed of the train be s km/h.

The distance to be covered by the train is 480 km.

The time taken will be

=480s hours

If the speed had been 8 km/h less, the time taken would be: 480s8 hours .

Now, according to the question,

480s8480s=3

480x480(x8)(x8)x=3

480x480x+3840=3(x8)x

3840=3x224x

3x224x3840=0

Dividing by 3 on both sides

x28x1280=0

Hence, the speed of the train satisfies the quadratic equation x28x1280=0

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Topics Covered in Chapter 4 Pair of Quadratic Equations: Exercise 4.1

  1. Definition of a Quadratic Equation: A polynomial equation with the highest degree of two is called a quadratic equation, and the quadratic equation is in the form of ax² + bx + c = 0, where a, b, and c are constants and a ≠ 0.
  2. Standard Form of a Quadratic Equation: The standard form of the quadratic equation is ax² + bx + c = 0, where a ≠ 0. It is most important to identify the quadratic equation to solve the quadratic equation.
  3. Identifying Quadratic Equations: In this Exercise, the equation is compared with the standard form of the quadratic equation to determine whether the equation is quadratic or not.
  4. Representing Real-Life Situations as Quadratic Equations: The exercise also involves converting word problems or scenarios into standard quadratic equations.

Also see-

NCERT Solutions of Class 10 Subject Wise

Students must check the NCERT solutions for class 10 of the Mathematics and Science Subjects.

NCERT Exemplar Solutions of Class 10 Subject Wise

Students must check the NCERT Exemplar solutions for class 10 of the Mathematics and Science Subjects.

Frequently Asked Questions (FAQs)

1. Check whether the polynomial 7x^2+6x+34=0 a quadratic polynomial.

The maximum index here is 2 . Also it is in the form of ax^2+bx+c=0 . 

Therefore 7x^2+6x+34=0 is a quadratic polynomial. 

2. Factorize the polynomial y^2-10y+24

y^2-10y+24=y2-4y-6y+24 

=y(y-4)-6(y-4) 

=(y-4)(y-6) 

3. Solve and check whether the equation n(n-1)=3 is a quadratic equation?

n(n-1)=3

n^2-n=3 

n^2-n-3=0 

The maximum index here is 2 . Also it is in the form of ax^2+bx+c=0 .

Therefore n(n-1)=3 is a quadratic polynomial. 

4. Write the coefficient of x in x^2-8x+130=0

The coefficient of x is -8 

5. What are the method used to solve the quadratic equations?

There are three main methods to solve the quadratic equation. 

They are, 

  • Factorisation 

  • Completing the square

  •  Quadratic Formula. 

6. How can quadratic equations be applied in our real life?

Quadratic equations can be used in calculating areas or rooms, determining a product’s profit in business or finding the speed of an object.

7. Define quadratic equation as per NCERT solutions for Class 10 Maths chapter 4 exercise 4.1 ?

A polynomial of degree two is alluded to as a quadratic polynomial. A quadratic polynomial has the overall structure ax^2+bx+c=0, where a, b and c  are real numbers.

8. What number of inquiries are tended to in the NCERT solutions for Class 10 Maths chapter 4 exercise 4.1, what kinds of inquiries right?

The inquiries are focused on the idea of making and settling quadratic conditions, and the  NCERT solutions for Class 10 Maths chapter 4 exercise 4.1 comprises of two questions with subsections.

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A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1)

2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

Option 4)

20,000 \, \, J - 50,000 \, \, J

A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

Option 1)

K/2\,

Option 2)

\; K\;

Option 3)

zero\;

Option 4)

K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

Option 4)

be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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