Question

Find the sum of 3 - 7i and 8 + 4i.

11 - 3i
11 + 3i
22 - 8i
-22 + 8i

Answer 1

3 - 7i + 8 + 4i = 3 + 8 - 7i + 4i = 11 - 3i.

The answer is A, 11-3i.

Answer 2

11 -3i

First option is correct.

Explanation:

We have to find the sum of the complex number 3 - 7i and 8 + 4i.

In adding two complex numbers, real part gets added with the real part and the imaginary part gets added with the imaginary part.

For the first complex numbers 3 - 7i, we have

real part = 3

imaginary part = -7i

For the second complex numbers 8 + 4i, we have

real part = 8

imaginary part = 4i.

Hence, the sum of the complex numbers is given by

3 - 7i + 8 + 4i

= (3+8) +(-7+4)i

= 11 -3i

First option is correct.