Complex Numbers and Their Properties

The video tutorial explains how to convert complex numbers from exponential form to Cartesian form. It covers three examples: converting a complex number to a real number, an imaginary number, and using a calculator for trigonometric approximations. The tutorial emphasizes understanding the radius and angle theta in the complex plane and provides step-by-step instructions for each example.

What is the first step in converting a complex number from exponential to Cartesian form?

• Plot the number on the complex plane

• Use a calculator to find trigonometric values

• Directly convert to Cartesian form

• Write the exponential form in polar form

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CCSS.HSN.CN.B.4

In the first example, what is the Cartesian form of the complex number with R=3 and Theta=PI?

• -3

• 3 + 0i

• -3i

• 0 + 3i

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CCSS.HSN.CN.B.4

Where would the complex number from the first example be plotted on the complex plane?

• On the imaginary axis

• On the real axis

• In the first quadrant

• At the origin

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CCSS.HSN.CN.B.4

In the second example, what is the Cartesian form of the complex number with R=5 and Theta=PI/2?

• 5

• 5i

• -5

• -5i

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CCSS.HSN.CN.B.4

Where would the complex number from the second example be plotted on the complex plane?

• On the real axis

• At the origin

• In the second quadrant

• On the imaginary axis

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CCSS.HSN.CN.B.4

In the third example, why is a calculator needed?

• To find the radius

• To approximate trigonometric values

• To convert radians to degrees

• To plot the complex number

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CCSS.HSN.CN.B.6

What is the approximate real part of the complex number in the third example?

• -4.5755

• -5.2976

• 4.5755

• 5.2976

What is the approximate imaginary part of the complex number in the third example?

• -4.5755

• -5.2976

• 4.5755

• 5.2976

What is the radius of the complex number in the third example?

• 4

• 7

• 3

• 5

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CCSS.HSN.CN.B.4

What is the angle Theta in radians for the complex number in the third example?

• 4

• PI

• PI/2

• 2

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CCSS.HSN.CN.B.4