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Nina [5.8K]
3 years ago
9

Find the product. (z + 3i)(z − 3i)

Mathematics
1 answer:
Doss [256]3 years ago
8 0

Answer:

First, we use distributive property:

(z+3i)(z-3i)=z^2-3zi+3zi-9i^2

Now, remember that i^2=-1, then

z^2-3zi+3zi-9i^2=z^2-9(-1)=z^2+9

Then,

(z+3i)(z-3i)=z^2+9

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