A2 Complex numbers and Quadratics

What is the value of i²?

• -1

• 1

• i

• -i

What is the value of i³?

• -1

• -i

• 1

• i

What is the value of i⁴?

• i

• -i

• -1

• 1

• 3

• -3

• 12

• -12

How do you write a complex number?

• a-bi

• a+bi

• ai+b

• ai-b

Simplify: 
(7 + 2i)(9 - 6i)

• 75-24i
• 63 - 24i  - 12i²
• 51 - 24i
• 58 + 60i

Multiply
(3i)(-2+4i)

• -6+12i
• -12-6i
• -2+7i
• 12+6i

Multiply: 
(4 – 3i)(7 + 2i)

• A.  22 - 13i
• B.  28 - 19i
• C.  34 - 13i
• D.  -34 - 29i