Complex Numbers Lesson

Multiply
(2i)(3i)

• 5i

• -5

• 6i

• -6

Multiply: 
(4 – 3i)(7 + 2i)

•  22 - 13i

•  28 - 19i

•  34 - 13i

•   -34 - 29i

What is the simplified form of (8 -3i)²?

• 73

• 16 - 6i

• 55 + 48i

• 55 - 48i

Match the expression to the graph shown in the complex plane.

• -2i-3i

• (0,-5)

• -6i

• -2(3i)

Match the expression to the graph shown in the complex plane.

• (4,0)

• 4 + 4i

• -4(i²)

• 4i

Simplify:  (4+2i)/(3-i)

• 1-i

• 1+i

• 10+10i

• 1+10i

What complex number is represented by the graph?

• -3-i

• -3+i

• 1+3i

• 1-3i

The rectangular form of the complex number 12(cos315^o + i sin315^o) is...

• 6√2 + 6√2 i

• 6√2 - 6√2 i

• -6√2 + 6√2 i

• -6√2 - 6√2 i

The product of the following complex number in polar form √5(cos130^o + i sin130^o) ⋅ √45(cos15^o + i sin15^o) is...

• 50(cos145^o + i sin145^o)

• 15(cos145^o + i sin145^o)

• 81(cos100^o + i sin100^o)

• All Options are Correct

The distance between z=4-3i and w=-2-4i on the complex plane is...

• √35

• √35 i

• √37

• 5i