Answer:
170
Explanation:
Given expression:
(13 + i)(13 - i)
We can use the difference of the squares formula, which states that

In this case, a = 13 and b = i.
Applying the formula, we have:

Now, we can simplify further:

represents the square of the imaginary unit i, and it is defined as -1. Therefore:

Substituting these values back into the equation, we get:

So, Therefore, the simplified expression is 170.