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Which of the following is a complex number?

a. -7
b. 2+√3
c. 4+9i
d. π

User Roganjosh
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2 Answers

1 vote
Hello,

Answer C
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User Mihir Dave
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1 vote

Answer: C. 4+9i

Explanation:

A combination of a real and an imaginary number is called complex number.

Since, - 7 is the negative integer and an integer is always the real number only therefore it can not be the complex number,

2+√3 is the irrational number which is only a real number therefore, it can not be the complex number,

In number 4+9i, 4 is the real number and 9i is the imaginary number, Therefore it is a complex number,

π is the irrational number and an irrational number is always a real number therefore it can be the complex number.

Thus, Option C is correct.


User Mike Ivanov
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