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Q&A HomeClass 11CBSEMathematicsComplex Numbers and Quadratic Equations
📐
Chapter 4

Complex Numbers and Quadratic Equations

Mathematics•Class 11•CBSE

16 Questions Available

Showing 16 questions on this page

1

Reduce (1/1 - 4i - 2/1 + i)(3 - 4i/5 + i) to the standard form.

9 views0 helpful
2

Convert the following in the polar form:

(i) (1 + 7i)/(2 - i)2

(ii) (1 + 3i)/(1 - 2i)

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3

Express the following in the form a + ib:

5 + √2i/1 - √2i

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4

If x - iy = √(a - ib/c - id), prove that (x2 + y2)2 = a2 + b2/c2 + d2.

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5

Find the number of non-zero integral solutions of the equation |1 - i|x = 2x.

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6

If 4x + i(3x - y) = 3 + i(-6), where x and y are real numbers, then find the value of x and y.

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7

Find the multiplicative inverse of 2 – 3i.

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8

Find the modulus and the argument of the complex number z = -√3 + i

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9

If z1 = 2 - i, z2 = 1 + i, find |(z1 + z2 + 1/z1 - z2 + 1)|

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10

If α and β are different complex numbers with |β| = 1, then find |(β - α/1 - ᾱβ)|

 

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11

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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12

If (1 + i/1 - i)m = 1, then find the least positive integral value of m.

 

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13

If (1 - i) is a root of the equation x2 + ax + b = 0, where a, b ∈ ℝ, then find the values of a and b.

 

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14

Find the square-root of 3 + 4i

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15

Solve the quadratic equation: x2 - x + (1 + i) = 0

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16

Find the condition that roots of the equation ax2 + bx + c = 0 are in the ratio m : n.

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