## Complex Numbers 1

### Secondary School Maths Ordinary Level

Each gap to be filled carries 10% but scores are lost for incorrect attempts.

Enter your answers into the gaps. When you have completed all question, click on CHECK at the bottom of the page.

Helpful hints:

When multiplying complex numbers, remember that the square of i = -1.

Group the real parts and add together.

Group the imaginary parts and add together.

Write down the real and imaginary parts of the complex number 7 + 4i.
Answer: real part: , imaginary part: .

Write down the real and imaginary parts of the complex number -1 -2i
Answer: real part: , imaginary part: .

Write (4 + 2i) + (5 +6i) in the form a + bi.
Answer:

Write (2 + i) + (6 + 4i) in the form a + bi.
Answer:

Write 2(4 + i) + 3(2 - i) in the form a + bi.
Answer:

Solve (2 + i)(3 + 5i). Write your answer in the form a + bi.
Answer:

Solve 5(1 + i) + i(6 - 2i). Write your answer in the form a + bi.
Answer:

Solve: -3i(-2 - 4)(-5-i). Write your answer in the form a + bi.
Answer: