2022-02-02

How do you multiply $\left(5+2i\right)\left(5-2i\right)?$

Eliza Norris

Step 1
It matters not if i is an imaginary number or not - the laws of algebra applies equally to all terms.
There is no difference between
$\left(5+2i\right)\left(5-2i\right)$ and $\left(5+2x\right)\left(5-2x\right)$
Therefore, the answer is $25-4{i}^{2}$

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