CP 4/9 Practice

What letter usually represent imaginary number?

• a
• i
• j
• x

What is the "real part" of the complex number (-2+7i)?

• 2

• -2

• 7i

• -7i

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

• 14+8i
• 48+16i
• 12-8i
• 2-8i

What does i² = ?

• -1
• √-1
• 1
• -√1

What is the simplified form of (-9 + 5i) + (3 -2i)

• -12 + 31i

• -6 + 3i

• -11 + 7i

• 5 - 3i

What is the simplifies form of (11 - 7i) - (-3 + 12i)

• 8 - 19i

• 8 + 5i

• 13- 19i

• 14 -19i

Simplify.

• -5i
• 5
• 5i
• -5

Simplify √-45

• 3i√5
• -3i√5
• -i√45
• 45i

What is the simplified form of (-3 + 2i)(1- 4i)

• -2 - 2i

• 5 + 14i

• -11 -10i

• -3 -8i