Answer:
Option 3 - [tex]4+9i[/tex]
Step-by-step explanation:
Given : Options in the figure.
To find : Which of the following is a complex number?
Solution :
Complex number is defined as the number which contains real number along with imaginary number.
The complex number is in the form of a+ib.
Now, we determine one by one.
Option 1 - -7
-7 is the real number not complex.
Option 2 - [tex]2+\sqrt{3}[/tex]
[tex]2+\sqrt{3}[/tex] is the real number not complex.
Option 3 - [tex]4+9i[/tex]
[tex]4+9i[/tex] is in the form a+ib so it is a complex number.
Option 4 - [tex]\pi[/tex]
[tex]\pi[/tex] is the real number not complex.
Therefore, Only option 3 is the complex number.
