Here’s how to perform basic arithmetic operations with complex numbers using a calculator:

1. Addition: To add two complex numbers together, simply add their real and imaginary components separately. For example, to add (3 + 4i) and (2 – i), you would input “3 + 4i + 2 – i” into the calculator and get the result of 5 + 3i.
2. Subtraction: To subtract one complex number from another, again, simply subtract their real and imaginary components separately. For example, to subtract (3 + 4i) from (2 – i), you would input “2 – i – (3 + 4i)” into the calculator and get the result of -1 – 5i.
3. Multiplication: To multiply two complex numbers together, use the distributive property and FOIL method. For example, to multiply (3 + 4i) and (2 – i), you would input “(3 + 4i) * (2 – i)” into the calculator and get the result of 10 + 5i.
4. Division: To divide one complex number by another, use the conjugate of the denominator to rationalize the expression. For example, to divide (3 + 4i) by (2 – i), you would input “(3 + 4i) / (2 – i)” into the calculator and get the result of 1.2 + 2.8i.

Many scientific and graphing calculators have built-in complex number functions, so you may be able to input the numbers directly into the calculator using the appropriate keys or buttons. Additionally, there are many online complex number calculators available that can perform more advanced operations, such as finding roots, powers, and logarithms of complex numbers.