N.7 - Complex Numbers

A complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is the imaginary unit, defined as the square root of -1.

The imaginary unit 'i' is defined as the square root of -1, which means i² = -1.

13 - 18i

5i

11 + 5i

-12 + 4i

3 - 4i

The conjugate of a complex number a + bi is a - bi.

To add two complex numbers, add their real parts and their imaginary parts separately.

To subtract two complex numbers, subtract their real parts and their imaginary parts separately.