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Complex numbers are generally considered to be abstract and difficult to understand at first, but they play a significant role in various domains such as signal processing, quantum physics and computer graphics. Similarly, quadratic equations are widely used in the fields of architecture, finance and astronomy to predict the outcomes and design the solutions.
The Miscellaneous Exercise of Class 11 Maths Chapter 4 provided in the NCERT discusses the key concepts provided in the chapter Complex Numbers and Quadratic Equations. This exercise consists of questions ranging from topics such as fundamentals of complex numbers, algebraic operations, and conjugates of complex numbers etc. Understanding the concepts given in complex numbers and quadratic equations builds a strong foundation for more advanced topics in mathematics, such as higher algebra, calculus, and even complex analysis. The NCERT solutions provided here are a useful exercise to get conceptual clarity on the topic of complex numbers and quadratic equations.
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Question 1: Evaluate
Answer:
The given problem is
Now, we will reduce it into
Now,
Therefore, answer is
Question 2: For any two complex numbers
Answer:
Let two complex numbers are
Now,
Hence proved
Question 3: Reduce
Answer:
Given problem is
Now, we will reduce it into
Now, multiply numerator an denominator by
Therefore, answer is
Question 4: If
Answer:
the given problem is
Now, multiply the numerator and denominator by
Now, square both the sides
On comparing the real and imaginary part, we obtain
Now,
Hence proved.
Question 5: If
Answer:
It is given that
Then,
Now, multiply the numerator and denominator by
Now,
Therefore, the value of
Question 6: If
Answer:
It is given that
Now, we will reduce it into
On comparing real and imaginary part. we will get
Now,
Hence proved
Question 7:(ii) Let
Answer:
It is given that
Therefore,
NOw,
Now,
Therefore,
Therefore, the answer is 0.
Question 8: Find the real numbers x andy if
Answer:
Let
Therefore,
Now, it is given that
Compare (i) and (ii) we will get
On comparing real and imaginary part. we will get
On solving these we will get
Therefore, the value of x and y are 3 and -3 respectively
Question 9: Find the modulus of
Answer:
Let
Now, we will reduce it into
Now,
square and add both the sides. we will get,
Therefore, modulus of
Question 10: If
Answer:
it is given that
Now, expand the Left-hand side
On comparing real and imaginary part. we will get,
Now,
Hence proved
Question 11: If
Answer:
Let
It is given that
and
Now,
Therefore, value of
Question 12: Find the number of non-zero integral solutions of the equation
Answer:
Given problem is
Now,
x = 0 is the only possible solution to the given problem
Therefore, there are 0 number of non-zero integral solutions of the equation
Question 13: If
Answer:
It is given that
Now, take mod on both sides
Square both the sides. we will get
Hence proved
Question 14: If
Answer:
Let
Now, multiply both numerator and denominator by
We will get,
We know that
Therefore, the least positive integral value of
Also read,
Complex Numbers: Complex numbers are numbers that include both a real part and an imaginary part. They are written in the form a + bi, where i represents the square root of -1.
Algebraic Operations with Complex Numbers: Just like real numbers, complex numbers can be added, subtracted, multiplied, and divided using standard algebraic rules, while keeping in mind that i² = -1.
Modulus and Conjugate of Complex Numbers: The modulus represents the distance of a complex number from the origin on the Argand plane. The conjugate is formed by changing the sign of the imaginary part.
Argand Plane and Polar Representation: Complex numbers can be plotted on a plane with real and imaginary axes. They can also be expressed in polar form using their modulus and the angle they make with the positive real axis.
Quadratic Equations: These are second-degree equations in one variable. When their discriminant is negative, their solutions are complex numbers, which extend the idea of solving equations beyond real numbers.
Also read
Students can also access the NCERT solutions for other subjects and make their learning feasible.
NCERT Solutions for Class 11 Maths |
NCERT Solutions for Class 11 Physics |
NCERT Solutions for Class 11 Chemistry |
NCERT Solutions for Class 11 Biology |
Use the links provided in the table below to get your hands on the NCERT exemplar solutions available for all the subjects.
Euler introduced symbol i for root(-1) first time
W,R. Hamilton
Z1Z2=(ac-bd)+i(ad+bc)
Yes, the statement is true. Example: 1 can be written as 1+0i
The argument of (1+i)/(1-i) is pi/2
5 questions are solved in the miscellaneous examples of complex numbers and quadratic equations.
Twenty questions of miscellaneous exercise chapter 5 Class 11 are solved in the Class 11 Maths chapter 5 miscellaneous exercise solutions
(1+i)/(1-i)=i
So the ordered pair is (0,1)
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