Illustrative Math Complex Numbers

Simplify: 
(7 + 2i)(9 - 6i)

• 75-24i

• 63 - 24i  - 12i²

• 51 - 24i

• 58 + 60i

Simplify 
√-25

• -5i

• 5

• 5i

• -5

√-108

• 3i√6

• 3i√20

• 6i√3

• 20i√3

Simplify
2i - 7i + 10

• -5i+10

• 5i

• 9i+10

• 5i+10

Write the complex number shown in the graph.

Where is point D located?

• 2 + i

• -3

• 2i

• -1 - i

What complex number is represented by the graph?

• -3-i

• -3+i

• 1+3i

• 1-3i

What letter usually represent imaginary number?

• a

• i

• j

• x

• e

Answer explanation

Simplify
3i - (4 + 7i)

• -4 + 10i

• 21 - 12i

• 4 - 10i

• -4 - 4i

Find the sum.
(5-2i) + (-7+8i)

• -2+6i

• 12+6i

• -35-16i²

• -35 -16i