Complex Numbers Quiz

What is the value of 'i' squared?

• 0

• -1

• 1

• i

Which of the following is a complex number?

• 3i

• 5

• 0

• 4 + 2i

If a complex number is written as a + bi, what is 'a' called?

• Imaginary part

• Coefficient

• Complex part

• Real part

How do you add two complex numbers?

• Multiply the real parts and imaginary parts separately

• Combine like terms

• Subtract the imaginary parts

• Divide the real parts

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

• 6i

• 13

• 0

• 4 + 9i

What happens to the imaginary part when you multiply conjugates?

• It becomes zero

• It doubles

• It remains unchanged

• It becomes negative

What is the purpose of rationalizing the denominator in complex division?

• To eliminate the real part

• To make the numerator zero

• To simplify the expression

• To increase the imaginary part

How do you simplify 60 + 20i divided by 10?

• 6 + 2i

• 60 + 2i

• 60 + 20i

• 6 + 20i

What is the result of dividing 7i by 5 - 3i after rationalizing the denominator?

• 21/34 - 35/34i

• 7/5 - 3i

• -21/34 + 35/34i

• 5/7 + 3i

Which operation is similar to rationalizing the denominator in complex numbers?

• Adding fractions

• Subtracting polynomials

• Rationalizing square roots

• Multiplying matrices