Exploring Operations with Complex Numbers

The video tutorial introduces complex numbers, explaining their components as a combination of real and imaginary numbers in the form a+bi. It covers graphing complex numbers on a complex plane, detailing the representation of real and imaginary parts on the x and y axes, respectively. The tutorial then moves on to operations with complex numbers, starting with addition and subtraction by combining like terms. It further explains multiplication, emphasizing the need to simplify i squared to negative one. Finally, the video addresses division of complex numbers, highlighting the use of conjugates to eliminate imaginary numbers from the denominator.

What is a complex number composed of?

• Two real numbers

• A rational number and an irrational number

• A real number and an imaginary number

• Two imaginary numbers

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CCSS.HSN.CN.A.1

In which form is a complex number typically written?

• a + bi

• a - bi

• a * bi

• a / bi

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CCSS.HSN.CN.B.4

What is the x-axis called in the complex plane?

• Imaginary axis

• Complex axis

• Argon axis

• Real axis

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CCSS.HSN.CN.B.4

How would you graph the complex number 2 + 5i?

• Move 2 units right and 5 units down

• Move 2 units left and 5 units down

• Move 2 units right and 5 units up

• Move 2 units left and 5 units up

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CCSS.HSN.CN.A.2

When adding complex numbers, which parts are combined?

• Only the real parts

• Only the imaginary parts

• Both real and imaginary parts separately

• Neither part

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CCSS.HSN.CN.A.2

What is the result of (4 + 2i) + (3 - 6i)?

• 7 + 8i

• 1 - 4i

• 7 - 4i

• 1 + 4i

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CCSS.HSN.CN.A.1

What is i squared equal to?

• 0

• i

• -1

• 1

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CCSS.HSN.CN.C.8

What is the simplified form of (2 + 3i)^2?

• 4 + 9i^2

• 4 + 6i + 9i^2

• 4 + 12i + 9

• 4 + 12i - 9

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CCSS.HSN.CN.A.3

What is the conjugate of 5 + 2i?

• -5 - 2i

• -5 + 2i

• 5 + 2i

• 5 - 2i

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CCSS.HSN.CN.A.3

What is the result of dividing 1 by 2 - i?

• 2 + i / 5

• 2 + i / 4

• 2 - i

• 2 + i

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CCSS.HSN.CN.A.3