Test on Complex Number

Simplify 
√-25

• -5i

• 5

• 5i

• -5

• 3i

• 9i

• 3

• 9

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

• -12 + 31i

• -6 + 3i

• -11 + 7i

• 5 - 3i

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

• 8 - 19i

• 8 + 5i

• 13- 19i

• 14 -19i

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

• -2 - 2i

• 5 + 14i

• -11 -10i

• -3 -8i

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

• 73

• 16 - 6i

• 55 + 48i

• 55 - 48i

3i(4 - i)

• 9i

• -3 +12i

• 12 - 3i

• 3 + 12i

Simplify (11 + 5i)(11 - 5i)

• 121 -110i

• 121 + 110i

• 146

• 121 - 25i²

Calculate the modulus (R) and argument (θ) for z = 4 + 9i

• R = 9.05, θ = 114°

• R = 9.85, θ = 66°

• R = 97, θ = 66°

• R = 9.85, θ = 294°

Calculate (multiply):
(1 − 2i)(6 + 5i)

• 16 − 7i

• -16 + 7i

• -16 − 7i

• 16 + 7i