Class 11 Maths
Complex Numbers and Quadratic Equations
Ex.5.1 Q.1
Express the given complex number in the form a + ib: (5i) (-3i ÷ 5).
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Ex.5.1 Q.2
Express the given complex number in the form a + ib: i9 + i19.
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Ex.5.1 Q.3
Express the given complex number in the form a + ib: i-39.
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Ex.5.1 Q.4
Express the given complex number in the form a + ib: 3(7 + i7) + i (7 + i7).
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Ex.5.1 Q.5
Express the given complex number in the form a + ib: (1 – i) – (–1 + i6).
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Ex.5.1 Q.6
Express the given complex number in the form a + ib: ( +
) – (4 +
).
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Ex.5.1 Q.7
Express the given complex number in the form a + ib: [( +
) + (4 +
)] – (-
+ i).
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Ex.5.1 Q.8
Express the given complex number in the form a + ib: (1 – i)4.
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Ex.5.1 Q.9
Express the given complex number in the form a + ib: ( + 3i)3
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Ex.5.1 Q.10
Express the given complex number in the form a + ib: (-2 – )3
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Ex.5.1 Q.11
Find the multiplicative inverse of the complex number 4 – 3i.
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Ex.5.1 Q.12
Find the multiplicative inverse of the complex number √5 + 3i.
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Ex.5.1 Q.13
Find the multiplicative inverse of the complex number -i.
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Ex.5.1 Q.14
Express the following expression in the form of a + ib.
{(3 + i√5) (3 - i√5)} ÷ {(√3 + i√2) - (√3 - i√2)}
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Ex.5.2 Q.1
Find the modulus and the argument of the complex number z = -1 - √3
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Ex.5.2 Q.2
Find the modulus and the argument of the complex number z = -√3 + i.
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Ex.5.2 Q.3
Convert the given complex number in polar form: 1 – i.
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Ex.5.2 Q.4
Convert the given complex number in polar form: -1 + i.
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Ex.5.2 Q.5
Convert the given complex number in polar form: -1 – i.
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Ex.5.2 Q.6
Convert the given complex number in polar form: -3.
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Ex.5.2 Q.7
Convert the given complex number in polar form: √3 + i.
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Ex.5.2 Q.8
Convert the given complex number in polar form: i.
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Ex.5.3 Q.1
Solve the equation x2 + 3 = 0
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Ex.5.3 Q.2
Solve the equation 2x2 + x + 1 = 0.
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Ex.5.3 Q.3
Solve the equation x2 + 3x + 9 = 0
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Ex.5.3 Q.4
Solve the equation –x2 + x – 2 = 0
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Ex.5.3 Q.5
Solve the equation x2 + 3x + 5 = 0.
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Ex.5.3 Q.6
Solve the equation x2 – x + 2 = 0
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Ex.5.3 Q.7
Solve the equation √2x2 + x + √2 = 0
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Ex.5.3 Q.8
Solve the equation √3x2 - √2x + 3√3 = 0
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Ex.5.3 Q.9
Solve the equation: x2 + x + = 0.
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Ex.5.3 Q.10
Solve the equation x2 + + 1 = 0
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Ex.Misc.Q.1
Evaluate: [i18 + ( )25]3.
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Ex.Misc. Q.2
For any two complex numbers z1 and z2, prove that
Re (z1z2) = Re z1 Re z2 – Im z1 Im z2
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Ex.Misc.Q.3
Reduce { –
{
} to the standard form.
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Ex.Misc.Q.4
If x – iy = √ {(a - ib) ÷ (c - id)}, prove that (x2 + y2)2 = {(a2 + b2) ÷ (c2 + d2)}
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Ex.Misc.Q.5
Convert the following in the polar form:
(1) (1 + 7i) ÷ (2 - i)2
(2) (1 + 3i) ÷ (1 – 2i)
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Ex.Misc.Q.6
Solve the equation 3x2 – 4x + = 0
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Ex.Misc.Q.7
Solve the equation x2 – 2x + = 0
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Ex.Misc.Q.8
Solve the equation 27x2 – 10x + 1 = 0
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Ex.Misc.Q.9
Solve the equation 21x2 – 28x + 10 = 0.
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Ex.Misc.Q.10
If z1 = 2 – i, z2 = 1 + i, find |z1 + z2 + 1|÷|z1 – z2 + i|.
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Ex.Misc.Q.11
If a + ib = (x + i)2 ÷ (2x2 + 1), prove that a2 + b2 = (x2 + 1)2 ÷ (2x + 1)2
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Ex.Misc.Q.11
Let z1 = 2 – i, z2 = -2 + i. Find
(1) Re {z1z2 ÷ }
(2) Im (1 ÷ z1 )
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Ex.Misc.Q.12
Find the modulus and argument of the complex number (1 + 2i) ÷ (1 – 3i).
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Ex.Misc.Q.14
Find the real numbers x and y if (x – iy) (3 + 5i) is the conjugate of –6 – 24i.
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Ex.Misc.Q.15
Find the modulus of {(1 + i) ÷ (1 - i)} - {(1 - i) ÷ (1 + i)}.
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Ex.Misc.Q.16
If (x + iy)3 = u + iv, then show that: +
= 4(x2 – y2).
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Ex.Misc.Q.17
If α and β are different complex numbers with |β| = 1, then find | (β - α) ÷ (1 - β) |
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Ex.Misc.Q.18
Find the number of non-zero integral solutions of the equation |1 – i|x = 2x
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Ex.Misc.Q.19
If (a + ib) (c + id) (e + if) (g + ih) = A + iB, then show that:
(a2 + b2) (c2 + d2) (e2 + f2) (g2 + h2) = A2 + B2
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Ex.Misc.Q.20
If {(1 + i) ÷ (1 - i)}m then find the least positive integral value of m.
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