In Exercises 1–8, add or subtract as indicated and write the result in standard form. (7 + 2i) + (1 - 4i)

Verified step by step guidance

Identify the real and imaginary parts of each complex number: $(7 + 2i)$ and $(1 - 4i)$.

Add the real parts together: $7 + 1$.

Add the imaginary parts together: $2i - 4i$.

Combine the results from the previous steps to form a new complex number.

Write the result in standard form $a + bi$, where $a$ is the real part and $b$ is the imaginary part.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.

Video duration:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Complex Numbers

Complex numbers are numbers that have a real part and an imaginary part, expressed in the form a + bi, where a is the real part, b is the imaginary part, and i is the imaginary unit defined as the square root of -1. Understanding complex numbers is essential for performing operations such as addition and subtraction.

Addition of Complex Numbers

To add complex numbers, you combine their real parts and their imaginary parts separately. For example, when adding (7 + 2i) and (1 - 4i), you add 7 and 1 to get 8, and 2i and -4i to get -2i, resulting in the sum 8 - 2i.

Standard Form of Complex Numbers

The standard form of a complex number is a + bi, where a and b are real numbers. It is important to express the result of operations on complex numbers in this form to clearly identify the real and imaginary components, facilitating further calculations and interpretations.

Recommended video: