Complex Numbers Introduction

Complex numbers can be _______ numbers.

• Imaginary

• Real

• ordinal

• p-adic

If z=-3i+7, Re(z)=

• 3

• -3

• 7

• -7

If z=5+8i, then Im(z)=

• 5

• 5i

• 8

• 8i

(5-i)(3+2i)=

(4+2i)/(1-i) 

If z= 3-8i, then  z* =

a and b are real numbers,

x^2+ax+b=0 has a root 1-i, the other root is?

• 1

• -1

• 1-i

• 1+i

a and b are real numbers

x^2+ax+b=6i has roots 2+3i. The another root is....

• 2

• -3i

• 2+3i

• 2-3i