NCERT Solution Complex Number part -1

Question 1:
Express the given complex number in the form a + ib: (5i)(-3i/5)
Question 2:
Express the given complex number in the form a + ib:
i⁹ +i¹⁹
Question 3:
Express the given complex number in the form a + ib: i^-39
Question 4:
Express the given complex number in the form a + ib: 3(7 + i7) + i(7 + i7)
Question 5:
Express the given complex number in the form a + ib: (1 – i) – (–1 + i6)
Question 6:
Express the given complex number in the form a + ib:
(1/5+2i/5)-(4+i5/2)
Question 7:
Express the given complex number in the form a + ib:

Question 8
Express the given complex number in the form a + ib: (1 – i)⁴
Question 9:
Express the given complex number in the form a + ib: (1/3+3i)³
Question 10
Express the given complex number in the form a + ib: (-2-1i/3)³
Question 11:
Find the multiplicative inverse of the complex number 4 – 3i.
Question 12:
Find the multiplicative inverse of the complex number

Question 13
Find the multiplicative inverse of the complex number –i
Question 14
Express the following expression in the form of a + ib.

Solution 1
(5i)(-3i/5)
Multiplying
=-(15/5)i²
Now we know that
i²=-1
so
=3
Solution 2
 i⁹ +i¹⁹
=i^{2X4 +1} +i^{4X4 +3}
=(i²)⁴ I + (i⁴)⁴ i³
Now i²=-1 so i⁴=1  and i³=-i
=i+(-i)
=i-i=0
Solution 3



Solution 4:
 3(7 + i7) + i(7 + i7)
=21+21i+7i+7i²
Now i²=-1
So
=21+28i-7
=14+28i
Solution  5:
(1 – i) – (–1 + i6)
=2-7i
Solution 6:
(1/5+2i/5)-(4+i5/2)
=[(1/5)-4] +i[(2/5) –(5/2)]
=(-19/5) +(-21/10)i
Solution 7:

Solution 8
(1 – i)⁴
Can be written as
=[(1-i)²]²
=(1+i²-2i)²
=(1-1-2i)²
=4i²=-4
Solution 9

Solution 10

Solution 11
Let z=4-3i
Conjugate is given by
  =4+3i
Modulus is given by
|z|=5
Multiple inverse of any complex number z  is given by

Solution 12
Let z= √5+3i
Conjugate is given by
  = √5-3i
Modulus is given by
|z|=5+9=14
Multiple inverse of any complex number z  is given by

Solution 13
Let z=-i
Conjugate is given by
  =i
Modulus is given by
|z|=1
Multiple inverse of any complex number z  is given by

Solution 14

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Also Read

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• Notes
  • What is complex numbers
  • Algebra Of complex Numbers
  • Conjugate of Complex Numbers
  • Modulus of complex numbers
  • Argand Plane
  • Polar Representation of the complex number
  • Rotation of Complex Number
  • Identities for Complex Numbers
  • Eulers formula and De moivre's theorem
  • Cube Root of unity
  • Complex roots of Quadratic equations
• NCERT Solutions & Worksheets
  • NCERT Solution Complex Numbers Exercise 5.1
  • Complex Numbers Problems
  • Complex Numbers Worksheet

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