Multiplying Two Complex Numbers
Multiplying two complex numbers is similar to multiplying two binomial algebraic expressions. We can use the distributive property of multiplication over addition.
Let's see how to multiply by .
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Multiplying two complex numbers is similar to multiplying two binomial algebraic expressions. We can use the distributive property of multiplication over addition.
Let's see how to multiply by .
Remember that , so we can substitute:
Now, let's group the real and imaginary parts:
So, the general formula for complex number multiplication is:
Let and . Find .
Solution:
Using the distributive property:
Or using the general formula with :
The result is the same!
Let and . Find .
Using the distributive property:
Using the general formula with :