Exploring Imaginary and Complex Numbers

Miss Smith's math tutorial introduces imaginary and complex numbers, explaining how to handle square roots of negative numbers by using 'i' to represent the square root of -1. The video provides examples of simplifying square roots of negative numbers, such as -64, -81, -7, -48, -80, and -18, demonstrating the process of separating negative components and simplifying radicals. The tutorial also covers complex numbers, which combine real and imaginary parts, and provides examples of simplifying expressions involving complex numbers.

What symbol is used to represent the square root of negative one?

• k

• n

• j

• i

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CCSS.HSN.CN.A.1

How do you simplify the square root of -64?

• 8

• 64

• 64i

• 8i

What is the simplified form of the square root of -81?

• 9i

• 81i

• 9

• 81

When simplifying the square root of -7, why is the 'i' placed in front of the radical?

• Because it looks better

• To indicate the imaginary part is outside the radical

• To make calculations easier

• It's a rule for all square roots

How do you simplify the square root of -48?

• 48i

• 4i√3

• 4√3

• 48

What is the simplified form of the square root of -80?

• 8i√5

• 80i

• 8√5

• 80

What is a complex number?

• A number with both real and imaginary parts

• A number with only real parts

• A number with only imaginary parts

• A number that cannot be simplified

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CCSS.HSN.CN.A.1

How would you write 4 plus 3i√2 in another acceptable form?

• 3i + 4√2

• 3i√2 + 4

• 4 + 3√2

• 4 + 3i

Tags

CCSS.HSN.CN.A.1

What is the simplified form of the square root of -25?

• 5i

• 25

• 25i

• 5

What should you do to simplify the square root of -60?

• Add 60

• Separate the negative and simplify the radical

• Multiply by 60

• Divide by 60