Graphing Functions with Complex Numbers - Algebra II
Card 0 of 10
Where would 
fall on the number line? 
Where would
Imaginary numbers do not fall on the number line-- they are by definition not real numbers.
** If the question asked where 
falls on the number line, the answer would be to the left of 0, because 
.
Imaginary numbers do not fall on the number line-- they are by definition not real numbers.
** If the question asked where
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Solve for 
Solve for
Use the change of base formula for logarithmic functions and incorporate the fact that 
and 
Or
can be solved using 
Use the change of base formula for logarithmic functions and incorporate the fact that
Or
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Write the complex number 
in polar form, where polar form expresses the result in terms of a distance from the origin 
on the complex plane and an angle from the positive 
-axis, 
, measured in radians.
Write the complex number
To see what the polar form of the number is, it helps to draw it on a graph, where the horizontal axis is the imaginary part and the vertical axis the real part. This is called the complex plane.
To find the angle 
, we can find its supplementary angle 
and subtract it from 
radians, so 
.
Using trigonometric ratios, 
and 
.
Then 
.
To find the distance 
, we need to find the distance from the origin to the point 
. Using the Pythagorean Theorem to find the hypotenuse 
, 
or 
.
To see what the polar form of the number is, it helps to draw it on a graph, where the horizontal axis is the imaginary part and the vertical axis the real part. This is called the complex plane.
To find the angle
Using trigonometric ratios,
Then
To find the distance
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Where does 
fall on the number line?
Where does 
Imaginary numbers do not fall on the number line by definition, since they are not real numbers. However, although i is an imaginary number equal to the square root of -1, 
is a real number since 
. Therefore, 
. Negative numbers fall to the left of 0 on a number line.
Imaginary numbers do not fall on the number line by definition, since they are not real numbers. However, although i is an imaginary number equal to the square root of -1, 
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Which complex number does this graph represent?
Real numbers are represented by the x-axis, and imaginary numbers are represented by the y-axis.
Which complex number does this graph represent?
Real numbers are represented by the x-axis, and imaginary numbers are represented by the y-axis.
In complex numbers of the form 
, a represents the real portion of the number and b represents the imaginary portion of the number. To graph 
on a plane in which real numbers are represented by the x-axis and imaginary numbers are represented by the y-axis, place a point a units right of the origin and b units above the origin. The graph shows a point 2 units right and 3 units above the origin, so the complex number represented is 
.
In complex numbers of the form 
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Which complex number does this graph represent?
Real numbers are represented by the x-axis, and imaginary numbers are represented by the y-axis.
Which complex number does this graph represent?
Real numbers are represented by the x-axis, and imaginary numbers are represented by the y-axis.
In complex numbers of the form 
, a represents the real portion of the number and b represents the imaginary portion of the number. To graph 
on a plane in which real numbers are represented by the x-axis and imaginary numbers are represented by the y-axis, place a point a units right of the origin and b units above the origin. The graph shows a point 5 units left and 2 units below the origin, so the complex number represented is 
.
In complex numbers of the form 
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Which of the following represents the real component of the complex number 
?
Which of the following represents the real component of the complex number 
In complex numbers of the form 
, a represents the real portion of the number and b represents the imaginary portion of the number. In the complex number 
, 
and 
.
In complex numbers of the form 
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Which of the following represents the imaginary component of the complex number -3 + ki, in which k is a constant?
Which of the following represents the imaginary component of the complex number -3 + ki, in which k is a constant?
In complex numbers of the form 
, 
represents the real portion of the number and 
represents the imaginary portion of the number. In the complex number 
, 
and 
In complex numbers of the form 
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Which complex number does this graph represent?
Real numbers are represented by the x-axis, and imaginary numbers are represented by the y-axis.
Which complex number does this graph represent?
Real numbers are represented by the x-axis, and imaginary numbers are represented by the y-axis.
In complex numbers of the form 
, a represents the real portion of the number and b represents the imaginary portion of the number. To graph 
on a plane in which real numbers are represented by the x-axis and imaginary numbers are represented by the y-axis, place a point a units right of the origin and b units above the origin. The graph shows a point 4 units right and 7 units below the origin, so the complex number represented is 
.
In complex numbers of the form 
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Which complex number does this graph represent?
Real numbers are represented by the x-axis, and imaginary numbers are represented by the y-axis.
Which complex number does this graph represent?
Real numbers are represented by the x-axis, and imaginary numbers are represented by the y-axis.
In complex numbers of the form 
, a represents the real portion of the number and b represents the imaginary portion of the number. To graph 
on a plane in which real numbers are represented by the x-axis and imaginary numbers are represented by the y-axis, place a point a units right of the origin and b units above the origin. The graph shows a point 8 units left and 1 unit above the origin, so the complex number represented is 
.
In complex numbers of the form 
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