Algebra 2 Add Subtract Multiply Complex Numbers

Front

What is a complex number?

Back

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.

Front

What is the imaginary unit 'i'?

Back

The imaginary unit 'i' is defined as the square root of -1. It is used to extend the real number system to include solutions to equations that do not have real solutions.

Front

How do you add complex numbers?

Back

To add complex numbers, combine the real parts and the imaginary parts separately. For example, (a + bi) + (c + di) = (a + c) + (b + d)i.

Front

How do you subtract complex numbers?

Back

To subtract complex numbers, subtract the real parts and the imaginary parts separately. For example, (a + bi) - (c + di) = (a - c) + (b - d)i.

Front

How do you multiply complex numbers?

Back

To multiply complex numbers, use the distributive property (FOIL method). For example, (a + bi)(c + di) = ac + adi + bci + bdi^2, and since i^2 = -1, simplify accordingly.

Front

What is the result of (10 + 15i) - (48 - 30i)?

Back

The result is -38 + 45i.

Front

What is the result of (2i + 4)(7i - 3)?

Back

The result is 22i - 26.

Front

What is the result of 3i - (4 + 7i)?

Back

The result is -4 - 4i.

Front

What is the result of 2i + 3 + 7 - 12i?

Back

The result is -10i + 10.

Front

What is the result of (7 + 2i) - (-12 - 4i)?

Back

The result is 19 + 6i.