# What is the sum of 12 – 5i and –3 + 4i ?

The sum of real numbers and imaginary numbers is called complex numbers. It is in the form a + bi where a is a real number and b is an imaginary part.

## Answer: The sum of 12 – 5i and –3 + 4i is 9 - i.

Let's find the sum of 12 – 5i and –3 + 4i.

**Explanation:**

The sum or difference of two complex numbers can be added just by adding or subtracting the real numbers and imaginary parts of the numbers.

⇒ (12 - 5i) + (– 3 + 4i)

⇒ [ 12 + (- 3) ] + [ (- 5i) + 4i ]

⇒ 9 - i

You can verify the answer using Cuemath's Complex Number Calculator.