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Complex Numbers & Quadratic Equations PPT Maths Class 11

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Number System 
Real Number Imaginary Numbers
Irrational Numbers Rational Numbers
Natural Number Whole Number Integers
Page 3


Number System 
Real Number Imaginary Numbers
Irrational Numbers Rational Numbers
Natural Number Whole Number Integers
Complex Numbers
A complex number is a number that can be expressed in the
form of a + bi.
Where a and b are real numbers and i is an imaginary unit.
In this expression, a is the real part and b is the imaginary part
of the complex number.
Page 4


Number System 
Real Number Imaginary Numbers
Irrational Numbers Rational Numbers
Natural Number Whole Number Integers
Complex Numbers
A complex number is a number that can be expressed in the
form of a + bi.
Where a and b are real numbers and i is an imaginary unit.
In this expression, a is the real part and b is the imaginary part
of the complex number.
Complex Numbers
When we combine the real and imaginary number, then a
complex number is formed.
Real Number + Imaginary Number = Complex Number
Page 5


Number System 
Real Number Imaginary Numbers
Irrational Numbers Rational Numbers
Natural Number Whole Number Integers
Complex Numbers
A complex number is a number that can be expressed in the
form of a + bi.
Where a and b are real numbers and i is an imaginary unit.
In this expression, a is the real part and b is the imaginary part
of the complex number.
Complex Numbers
When we combine the real and imaginary number, then a
complex number is formed.
Real Number + Imaginary Number = Complex Number
A complex number has a real part and an imaginary part, but
either part can be 0.
So, all real numbers and imaginary numbers are also complex
numbers.
Complex Numbers
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FAQs on Complex Numbers & Quadratic Equations PPT Maths Class 11

1. How are complex numbers defined?
Ans. Complex numbers are defined as numbers of the form a + bi, where a and b are real numbers and i is the imaginary unit, defined as the square root of -1. The real part of a complex number is denoted by a, and the imaginary part is denoted by b.
2. What is the significance of complex numbers in quadratic equations?
Ans. Complex numbers play a crucial role in solving quadratic equations. When the discriminant of a quadratic equation is negative, it indicates that the equation has complex solutions. These complex solutions help us understand the behavior of the quadratic equation and its graph.
3. How do we find the roots of a quadratic equation with complex coefficients?
Ans. To find the roots of a quadratic equation with complex coefficients, we can use the quadratic formula. The formula states that the roots of the equation ax^2 + bx + c = 0 are given by x = (-b ± √(b^2 - 4ac))/(2a). Here, if the discriminant (b^2 - 4ac) is negative, it indicates the presence of complex roots.
4. Can a quadratic equation have both real and complex roots?
Ans. Yes, a quadratic equation can have both real and complex roots. The nature of the roots depends on the discriminant of the equation. If the discriminant is positive, the equation has two distinct real roots. If the discriminant is zero, the equation has two identical real roots. If the discriminant is negative, the equation has two complex roots.
5. How are complex numbers represented geometrically?
Ans. Geometrically, complex numbers can be represented as points in a two-dimensional plane called the complex plane. The real part of the complex number corresponds to the x-coordinate, and the imaginary part corresponds to the y-coordinate. The complex number a + bi can be represented as the point (a, b) in the complex plane. The distance from the origin to the point represents the magnitude of the complex number, and the angle it makes with the positive x-axis represents its argument.
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