l2 complex numbers ws

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COMPLEX NUMBERS 1) Find the real and imaginary parts of the following: a) z = -4+2i b) z = 2i c) z = 5 d) z = 0 Powers of i : 2) Simplify each expression. a) i 562 b) i 211 c) i 4n+3 , n N d) i 16 –i + i 1993 3) Find the coefficient of the imaginary part: i 20 + 6i 1995 4) If P(x) = 4x 79 -2x 56 +3x 15 +2 , find P(i). 5) If f(x) = x 20 –x 13 -2x 22 + 4 , find f(i). Equality : 6) z 1 = 2x +1+3i and z 2 = y +(x-2)i , if z 1 = z 2 find x and y. 7) If 8i 3 +yi 2 +5xi+4i 8 = 3xi 9 +2y, find x and y. 8) If x+2y-2i = 5+4xi-3yi, find x.

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Page 1: L2 complex numbers ws

COMPLEX NUMBERS

1) Find the real and imaginary parts of the following:

a) z = -4+2i b) z = 2i c) z = 5 d) z = 0

Powers of i :

2) Simplify each expression.

a) i562 b) i211 c) i4n+3 , n N d) i16 –i + i1993

3) Find the coefficient of the imaginary part: i20 + 6i1995

4) If P(x) = 4x79 -2x56 +3x15 +2 , find P(i).

5) If f(x) = x20 –x13 -2x22 + 4 , find f(i).

Equality :

6) z1 = 2x +1+3i and z2 = y +(x-2)i , if z1 = z2 find x and y.

7) If 8i3+yi2+5xi+4i8 = 3xi9+2y, find x and y.

8) If x+2y-2i = 5+4xi-3yi, find x.

9) z1 = (2x-3y+1)-(3x-2y-1)i and z2 = (x+y-4)+(x-4y+2)i. If z1 = z2 , find x+y.

Answers1) a) -4,2 b) 0,2 c) 5,0 d) 0,0 2) a) -1 b) -i c) -i d)1 3) -6 4) -7i 5) 7-i 6) 5, 11

7) 4, 4/3 8) 1 9) 9/2

Page 2: L2 complex numbers ws

PAGE 2:

Conjugates:

10) z = -2-5i , find Im( ).

11) (1+i)z =2+i+3i5, find .

12) i +(1+2i) = zi-5 , find z.

13) If z =

14) If , find a+b.

15) If z(3-i) = 1- , find z.

Mixed examples Set 1

16) a) b)

c) d) e)

17) 18) 19)

Answers10) 5 11) 3-i 12) -2-i 13) -11/13 14) 12/5 15) 2/9+i/9

16) a) 7i b) 10i c) -3 d) e) 2 17) 8 18) 19)

Page 3:

Page 3: L2 complex numbers ws

20) 21) (1+i)(1+i3)(1+i6)

22) 23)

24) P(x) = -x6 + 2x5 -3x3 +1 , find P(-i ) .

25) z C, (2-i)z = 1- , find Re(z) and Im(z).

26) P(x,y) = x15 + 2x34y35 + x59y11 – y61 . Find P(i,-i).

27) P (x,y) = 3x17y12 – x12y10 + x3y5 . Find P(-i,i).

28) f(z) = , g(z) = iz , find (fog)(2-i).

29) f(z) = , g(z) = , find (fog)(2+i).

Answers20) -1-i 21) 0 22) 23) i 24) 2-5i 25) ¼,¼ 26) 1-2i 27) -3i 28) 1-i 29) 4+2i

Page 4Mixed examples Set 2

Page 4: L2 complex numbers ws

30) işleminin sonucu kaçtir?

31) olduğuna göre, nedir?

32) eşitliğini sağlayan z karmaşık sayısının gerçel kısmı kaçtır?

33) karmaşık sayısının eşiti kaçtır?

34) olduğuna göre, z karamaşık sayısı nedir?

35) olduğuna göre, a pozitif gerçel sayısı nedir?

36) , olduğuna göre, x aşağıdakilerden hangisi olabilir?

A) -2 B) -1 C) 2 D) 4 E) 5

Answers30) 31) 0 32) 0 33) 34) 8 35) ½ 36) D