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Test your basic knowledge |
CLEP General Mathematics: Complex Numbers
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Subjects
:
clep
,
math
Instructions:
Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A plot of complex numbers as points.
Complex Numbers: Add & subtract
Polar Coordinates - cos?
Complex Number Formula
Argand diagram
2. 3
Polar Coordinates - r
four different numbers: i - -i - 1 - and -1.
Affix
i^3
3. (2i+3)/(9-i)for the denominator you multiply by the conjugate and what u do to the bottom u have to do to the top then you distribute the bottom then the top then add like terms then you simplify. 21i+25/17
Polar Coordinates - Arg(z*)
Affix
How to solve (2i+3)/(9-i)
The Complex Numbers
4. All numbers
Polar Coordinates - Multiplication by i
Any polynomial O(xn) - (n > 0)
Polar Coordinates - Multiplication
complex
5. Has the opposite sign of a complex number; the conjugate of a + bi is a - bi
i^1
conjugate
the complex numbers
(a + bi) = (c + bi) = (a + c) + ( b + d)i
6. When two complex numbers are subtracted from one another.
Complex Conjugate
Polar Coordinates - Multiplication by i
Rational Number
Complex Subtraction
7. When two complex numbers are divided.
Complex Addition
i^3
Complex Division
Polar Coordinates - Arg(z*)
8. Multiply moduli and add arguments
integers
the distance from z to the origin in the complex plane
(a + c) + ( b + d)i
Polar Coordinates - Multiplication
9. E^(i?) = cos? + isin? ; e^(ip) + 1 = 0
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10. A subset within a field.
the distance from z to the origin in the complex plane
Polar Coordinates - sin?
Subfield
the vector (a -b)
11. A number that can be expressed as a fraction p/q where q is not equal to 0.
Rational Number
Irrational Number
i²
-1
12. I
conjugate pairs
Subfield
i^1
has a solution.
13. 4th. Rule of Complex Arithmetic
non-integers
rational
(a + bi) = (c + bi) = (a + c) + ( b + d)i
Euler Formula
14. I^2 =
has a solution.
-1
Irrational Number
irrational
15. No i
standard form of complex numbers
How to multiply complex nubers(2+i)(2i-3)
real
a + bi for some real a and b.
16. Every complex number has the 'Standard Form':
Complex numbers are points in the plane
non-integers
a + bi for some real a and b.
conjugate pairs
17. Not on the numberline
sin iy
non-integers
Polar Coordinates - z
Complex Numbers: Add & subtract
18. The field of all rational and irrational numbers.
Real Numbers
Complex Division
Polar Coordinates - Multiplication by i
Imaginary Unit
19. V(x² + y²) = |z|
imaginary
|z-w|
Polar Coordinates - r
zz*
20. xpressions such as ``the complex number z'' - and ``the point z'' are now
Polar Coordinates - z
(a + c) + ( b + d)i
interchangeable
Complex Addition
21. 1
(a + c) + ( b + d)i
Rules of Complex Arithmetic
Polar Coordinates - Multiplication by i
i²
22. Starts at 1 - does not include 0
four different numbers: i - -i - 1 - and -1.
Euler's Formula
natural
(a + c) + ( b + d)i
23. (e^(-y) - e^(y)) / 2i = i sinh y
Polar Coordinates - sin?
sin iy
0 if and only if a = b = 0
Euler Formula
24. (a + bi) = (c + bi) =
cos iy
cos z
Polar Coordinates - Multiplication
(a + c) + ( b + d)i
25. V(zz*) = v(a² + b²)
|z| = mod(z)
Absolute Value of a Complex Number
non-integers
Argand diagram
26. 2nd. Rule of Complex Arithmetic
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27. Rotates anticlockwise by p/2
complex
Polar Coordinates - Multiplication by i
Irrational Number
adding complex numbers
28. When two complex numbers are added together.
Affix
cosh²y - sinh²y
Complex Addition
|z| = mod(z)
29. Complex Plane = i - Use the distance formula to determine the point's distance from zero - or - the absolute value.
cosh²y - sinh²y
Polar Coordinates - sin?
interchangeable
Absolute Value of a Complex Number
30. If z= a+bi is a complex number and a and b are real - we say that a is the real part of z and that b is the imaginary part of z
real
sin iy
Real and Imaginary Parts
i^3
31. 1
subtracting complex numbers
standard form of complex numbers
i^2
Complex Division
32. When you subtract two complex numbers a + bi and c + di - you get the difference of the real parts and the difference of the imaginary parts: (a + bi) - (c + di) = (a - c) + (b - d)i
Complex numbers are points in the plane
The Complex Numbers
subtracting complex numbers
Complex Conjugate
33. (e^(iz) - e^(-iz)) / 2i
sin z
Complex numbers are points in the plane
Euler's Formula
Integers
34. 1
Polar Coordinates - Arg(z*)
Any polynomial O(xn) - (n > 0)
i^4
How to solve (2i+3)/(9-i)
35. The product of an imaginary number and its conjugate is
i^1
How to multiply complex nubers(2+i)(2i-3)
Rational Number
a real number: (a + bi)(a - bi) = a² + b²
36. To simplify a complex fraction
multiply the numerator and the denominator by the complex conjugate of the denominator.
Imaginary Numbers
Complex Exponentiation
cos z
37. Equivalent to an Imaginary Unit.
z - z*
Imaginary number
integers
sin z
38. Notice that rules 4 and 5 state that we complex numbers together - we can divide by c + di if c and d are not both zero. But there is a much easier way to do division.
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39. For real a and b - a + bi =
i^0
0 if and only if a = b = 0
x-axis in the complex plane
|z-w|
40. To simplify the square root of a negative number
-1
Imaginary Unit
ac + bci + adi + bdi^2 =(ac - bc) + (bc + ad)i
you write the square root as the product of square roots and simplify: v(-a) = v(-1)v(a) = iv(a)
41. Given (4-2i) the complex conjugate would be (4+2i)
'i'
Complex Numbers: Add & subtract
Complex Conjugate
zz*
42. We see in this way that the distance between two points z and w in the complex plane is
The Complex Numbers
|z-w|
How to multiply complex nubers(2+i)(2i-3)
Argand diagram
43. E^(ln r) e^(i?) e^(2pin)
e^(ln z)
integers
Complex Conjugate
Subfield
44. Real and imaginary numbers
complex numbers
subtracting complex numbers
four different numbers: i - -i - 1 - and -1.
Complex Exponentiation
45. Any number not rational
complex numbers
z - z*
irrational
cos z
46. Written as fractions - terminating + repeating decimals
How to solve (2i+3)/(9-i)
Complex Division
Polar Coordinates - Division
rational
47. 3rd. Rule of Complex Arithmetic
Polar Coordinates - z?¹
cos z
For real a and b - a + bi = 0 if and only if a = b = 0
can't get out of the complex numbers by adding (or subtracting) or multiplying two
48. 2ib
z - z*
i^1
Polar Coordinates - Multiplication
Complex Numbers: Add & subtract
49. One of the numbers ... --2 --1 - 0 - 1 - 2 - ....
sin iy
rational
Integers
Imaginary Unit
50. All the powers of i can be written as
sin z
four different numbers: i - -i - 1 - and -1.
multiply the numerator and the denominator by the complex conjugate of the denominator.
Polar Coordinates - Multiplication by i
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