What is the real part of 4−5i ?
The real part of 4−5i is 4.
What is the imaginary part of 7−6i ?
The imaginary part of 7−6i is -6.
1.
Which of the following statements is not true?
A. Every real number is also a complex number.
B. In order for a +bi to be a complex number, b must be nonzero.
C. A complex number is a number that can be written in the form a +bi where a and b are real numbers.
D. For a complex number written in the form a +bi the value of a is called the real part of the complex number.
The statement that is not true is option B. In order for a + bi to be a complex number, b does not have to be nonzero. In fact, if b is equal to zero, the complex number reduces to a real number.
To find the real part of a complex number, you simply take the part that does not involve the imaginary unit, "i".
In the case of the complex number 4-5i, the real part is 4.
To find the real part of a complex number, you simply take the coefficient of the real part, which is the part of the complex number without the imaginary unit.
In this case, the complex number is 4 - 5i, where 4 is the real part and -5i is the imaginary part. Therefore, the real part of 4 - 5i is 4.