Understanding Complex Numbers

What is a complex number?

• A number with both a real and an imaginary part

• A number with only an imaginary part

• A number with only a real part

• A number with no real or imaginary part

What is the imaginary unit 'i' equivalent to?

• The square root of 1

• The square root of -1

• The square root of 0

• The square root of 9

What is the result of multiplying a real number by the imaginary unit 'i'?

• A negative number

• A real number

• A complex number

• An imaginary number

Which of the following is a complex number?

• 4 + 3i

• 3i

• 0

• 5

What is the general form of a complex number?

• a - bi

• a + bi

• a / bi

• a * bi

What happens when you add a real number and an imaginary number?

• You get a complex number

• You get an imaginary number

• You get a real number

• You get zero

What is the real part of the complex number 11 + 2i?

• i

• 2

• 11

• 0

How can every real number be considered a complex number?

• By adding 1 as its imaginary part

• By adding 0 as its imaginary part

• By subtracting 1 from its real part

• By multiplying it by i

What is the imaginary part of the complex number 7 + 0i?

• i

• 7i

• 7

• 0

Which of the following is NOT a complex number?

• i

• 7

• 5 - 2i

• 3 + 4i