Adding and Subtracting Rational Expressions

What is the imaginary unit 'i' defined as?

• i = 1

• i = -1

• i^2 = -1

• i^2 = 1

How do you express the square root of -25 using the imaginary unit?

• 25i

• ±5i

• -5i

• 5i

What is the value of i^3?

• -1

• i

• 1

• -i

What is the value of i^4?

• i

• -1

• -i

• 1

What is the real part of the complex number 5 - 2i?

• -5

• 2

• -2

• 5

What is the imaginary part of the complex number 5 - 2i?

• -5

• 2

• -2

• 5

When adding complex numbers, which part should be combined first?

• Imaginary part

• Real part

• Both parts simultaneously

• None of the above

What is the result of multiplying (3 + 2i) and (1 - i)?

• 5 - i

• 3 - i

• 5 + i

• 3 + i

What is the conjugate of the complex number 4 + 3i?

• 4 + 3i

• -4 + 3i

• -4 - 3i

• 4 - 3i

Why is it necessary to rationalize the denominator when dividing complex numbers?

• To make the numerator real

• To remove the imaginary unit from the denominator

• To make the denominator zero

• To simplify the expression