Secondary 2 Number Sense

Which of the following is an irrational number?

• 3/4

• √9

• π

• -5

Which of the following is a complex number?

• 3

• √-4

• -2/5

• -2.56765

Simplify the expression: (2 + 3i) + (4 - i)

• 6 + 2i

• 8 - 2i

• 6 - 2i

• 2i+6

Multiply the complex numbers: (2 + i)(3 - 2i)

• 4 + 7i

• 8 - i

• 7 + 4i

• 6 - 2i

• x = 3 + 2i, x = 3 - 2i

• x = 6 + 13i, x = 6 - 13i

• x = -3 + 2i, x = -3 - 2i

• x = 2 + 3i, x = 2 - 3i

Standard N.CN.3: Conjugates of Complex Numbers Multiple Choice: The conjugate of the complex number 3 + 2i is:

• 3 - 2i

• -3 + 2i

• -3 - 2i

• 2 - 3i

Multiple Choice: Which of the following points represents the complex number -2 + 4i on the complex plane?

• (-2, 0)

• (0, -2)

• (-2, 4)

• (4, -2)

Solve: Graphically add the complex numbers -1 + 2i and 3 - 4i on the complex plane. Find the resultant complex number in rectangular form.

• The resultant complex number is 2 - 2i.

• The resultant complex number is -4 + 6i.

• The resultant complex number is 4 - 6i.

• The resultant complex number is -2 + 2i.