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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.
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.
Q1 (i) Check whether the following are quadratic equations:
Answer:
We have L.H.S.
Therefore,
i.e.,
Or
This equation is of the type:
Hence, the given equation is a quadratic equation.
Q1 (ii) Check whether the following are quadratic equations:
Answer:
Given equation
i.e.,
This equation is of the type:
Hence, the given equation is a quadratic equation.
Q1 (iii) Check whether the following are quadratic equations:
Answer:
L.H.S.
and R.H.S
i.e.,
The equation is of the type:
Hence, the given equation is not a quadratic equation since a = 0.
Q1 (iv) Check whether the following are quadratic equations:
Answer:
L.H.S.
and R.H.S
i.e.,
This equation is of type:
Hence, the given equation is a quadratic equation.
Q1 (v) Check whether the following are quadratic equations:
Answer:
L.H.S.
and R.H.S
i.e.,
This equation is of type:
Hence, the given equation is a quadratic equation.
Q1 (vi) Check whether the following are quadratic equations:
Answer:
L.H.S.
and R.H.S
i.e.,
This equation is NOT of type:
Here, a = 0, hence, the given equation is not a quadratic equation.
Q1 (vii) Check whether the following are quadratic equations:
Answer:
L.H.S.
and R.H.S
i.e.,
This equation is NOT of type:
Hence, the given equation is not a quadratic equation.
Q1 (viii) Check whether the following are quadratic equations:
Answer:
L.H.S.
and R.H.S
i.e.,
This equation is of the type:
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
Answer:
Given that the area of a rectangular plot is
Let the breadth of the plot be
Then, the length of the plot will be:
Therefore, the area will be:
Hence, the length and breadth of the plot will satisfy the equation
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
Let two consecutive integers be
Then, their product will be:
Or
Hence, the two consecutive integers will satisfy this quadratic equation
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
Then his mother's age will be:
After three years,
Rohan's age will be
Then, according to the question,
The product of their ages 3 years from now will be:
Hence, the age of Rohan satisfies the quadratic equation
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
The distance to be covered by the train is
If the speed had been
Now, according to the question,
Dividing by 3 on both sides
Hence, the speed of the train satisfies the quadratic equation
Also Read:
Also see-
Students must check the NCERT solutions for class 10 of the Mathematics and Science Subjects.
Students must check the NCERT Exemplar solutions for class 10 of the Mathematics and Science Subjects.
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.
y^2-10y+24=y2-4y-6y+24
=y(y-4)-6(y-4)
=(y-4)(y-6)
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.
The coefficient of x is -8
There are three main methods to solve the quadratic equation.
They are,
Factorisation
Completing the square
Quadratic Formula.
Quadratic equations can be used in calculating areas or rooms, determining a product’s profit in business or finding the speed of an object.
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.
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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